I am under the impression that you can only choose a few quests a day, and what the answers are. Does anyone know the answer? And I also have all the hidden mickeys, what exactly does that net me?

Check out this thread for the quests:
http://www.vmkforums.com/forums/showthread.php?t=1818

The Tomorrowland Quest you print from your computer from the VMK site and bring it with you to Disney World. the other three quests you get from the VMK Central in the Main Street Cinema at the Magic Kingdom Theme Park in WDW. Here's the link to the Tomorrowland Quest:
http://avmk.disney.go.com/media/vmk/en_US/quests/tomorrowland/TomorrowlandMagicKingdomQuest.pdf

As for the Hidden Mickey Quest, if found all fifty you should have received a link to a special .pdf file that you would print and bring it with you to redeem inside VMK Central in WDW for your prize.

You have to do all four quests (Tomorrowland, Adventureland, Fantasyland, Frontierland) and answer all questions correctly to win the tour. Right now, the tour is uncertain because there is a quest on the tour for the Haunted Mansion but the ride may be closed down for refurbishment. Some say a new quest for Pirates is coming soon. But from what i hear the tour spaces fill up fast.

The 30 or 90 day limit only applies when you do the same quests multiple times (for example you can only go on the tour once every 30 or 90 days). You only receive prizes one of each type of prize per park ticket. For Annual Passholders the 30/90 day limit applies since they have the same ticket and they are frequent visitors to the parks

Yes, but what exactly does the .pdf file net me when I print it out and hand it in at the park?

usually varies, when i did the mickey quest, i got a .pdf with the pass for an insider tour (but that was a long time ago). You get other ones from doing certain things in the other games, but i don't know how you get them
1.) Get top score in fireworks game for first time: .pdf for VMK wristband
2.) there are others like the Captain Nemo Chair but i don't how you get them. they came out well after i started playing VMK. But i suspect it is when you reach certain milestones in the Pirates and Jungle Cruise games.

usually varies, when i did the mickey quest, i got a .pdf with the pass for an insider tour (but that was a long time ago). You get other ones from doing certain things in the other games, but i don't know how you get them
1.) Get top score in fireworks game for first time: .pdf for VMK wristband
2.) there are others like the Captain Nemo Chair but i don't how you get them. they came out well after i started playing VMK. But i suspect it is when you reach certain milestones in the Pirates and Jungle Cruise games.
I got the PDF for the wristband after playing PotC level three for the first time.

I hope you have fun in Disney World! Here are some of the questing information that should be thorough enough for anyone to understand to the fullest extent.

You can pick up a quest at the Magic Kingdom park at Walt Disney World. From there on, if you travel down Main Street USA, there will be a "Cinema" that says "Now Playing: the Virtual Magic Kingdom". If you enter that shop, all of the "land" quests will be available there.

Each of the quests are: Fantasyland, Frontierland, Adventureland, and Tomorrowland. All of these quests are obtainable there. You do not have to print the Tomorrowland quest from home. If you ask a VMK Cast Member on duty nicely, they have extra copies there.

You can do all of the "land" quests at all one time. You do not have to do one and then wait until your next visit to do another.

Each quest takes about an hour to an hour and a half to successfully complete, depending on how many people are there. I did the Frontierland quest at Christmas time, in their off season, and it took me about 45 minutes.

Once you have completed all of the quests, turn them in and receive your VMK Insider Tour card. Take that to Guest Relations (City Hall) to sign up for your tour. If it is your only day to visit the Magic Kingdom, try to sign yup for a tour that occurs on that same day. Within that tour, being about two hours long, you will do some additional quests and also learn about some new, upcoming plans for VMK.

I hope this covers all quest information. As far as the answers, I do not suggest getting them from other players. Not only does it ruin the experience for you, it will not teach you anything about Disney, let alone take you to some places in the Magic Kingdom you have never noticed before. If you don't heed this logical tip anyway, I'm sure you'll find the answers from someone sometime.

I hope you have fun in Disney World! Here are some of the questing information that should be thorough enough for anyone to understand to the fullest extent.

You can pick up a quest at the Magic Kingdom park at Walt Disney World. From there on, if you travel down Main Street USA, there will be a "Cinema" that says "Now Playing: the Virtual Magic Kingdom". If you enter that shop, all of the "land" quests will be available there.

Each of the quests are: Fantasyland, Frontierland, Adventureland, and Tomorrowland. All of these quests are obtainable there. You do not have to print the Tomorrowland quest from home. If you ask a VMK Cast Member on duty nicely, they have extra copies there.

You can do all of the "land" quests at all one time. You do not have to do one and then wait until your next visit to do another.

Each quest takes about an hour to an hour and a half to successfully complete, depending on how many people are there. I did the Frontierland quest at Christmas time, in their off season, and it took me about 45 minutes.

Once you have completed all of the quests, turn them in and receive your VMK Insider Tour card. Take that to Guest Relations (City Hall) to sign up for your tour. If it is your only day to visit the Magic Kingdom, try to sign yup for a tour that occurs on that same day. Within that tour, being about two hours long, you will do some additional quests and also learn about some new, upcoming plans for VMK.

I hope this covers all quest information. As far as the answers, I do not suggest getting them from other players. Not only does it ruin the experience for you, it will not teach you anything about Disney, let alone take you to some places in the Magic Kingdom you have never noticed before. If you don't heed this logical tip anyway, I'm sure you'll find the answers from someone sometime.
Thank you a lot!