First of all, welcome to the DIS Boards!
As for how many ADR's you need to make...opinions vary greatly on that. A lot depends on the size of your party, how busy it is the time of year you are visiting, and how flexible you are about where and when you eat.
If you have a large party, you should try to make as many ADR's as you can.
If you know you want to eat at a certain restaurant, definitely make an ADR. You can always cancel it if it doesn't fit in with that day's plans once you get there, but you may not get in if you don't have an ADR.
If you don't mind eating at odd times, aren't picky about where you eat, or don't mind eating CS meals if you can't get into a table service restaurant, then you won't need to make many ADR's.
With the Magic Your Way dining plan's popularity, it is much more difficult to walk in to restaurants without an ADR than it used to be. While no one wants to plan every minute of their trip months ahead of time, it really pays to have a few ADR's in place.
Happy planning, and if you have any other questions, please ask!
