@ThomasSA - Welcome! @WeHave2GoBack gives very good advice.
I planned our first trip to WDW last fall. We decided to do it in October and the trip was planned for the first week of February. We were already past the 180 day point, but we still had a wonderful trip and got to eat at excellent restaurants. I’m just saying that to let you know that your trip will be wonderful no matter what!
Definitely start out by choosing where you want to spend each day. I wouldn’t bother with getting a park hopper for your first trip. It just complicates things and costs extra. Use the TP crowd calendar to decide where you’ll go each day.
As for planning ADRs, I started by reading the restaurant reviews in the Unofficial Guide and on the [Disney Food Blog]
: http://www.disneyfoodblog.com/disney-world-restaurants-guide/ I linked to their navigation page that lists each restaurant by location.
Then you have to decide where you want to eat. Depending on your family, it might be a good idea to limit yourself to one table service meal per day. It’s possible to do more, but each one takes up 1.5 to 2 hours and portions are huge. I made a list of my top two choices for each park. (We 2 days in MK and one day in each of the other three parks.) Then I realized that there are some really good resort restaurants near each park, so I added those into my considerations. You don’t want to have to travel all over the place! For example, if you want to eat at a monorail resort restaurant, you should do that on a Magic Kingdom day.
We ended up with Boma at AKL for our Animal Kingdom day, Liberty Tree Tavern for lunch at MK, SciFi at Hollywood Studios, and Via Napoli at Epcot. We also snagged a last minute Be Our Guest dinner ADR for our second Magic Kingdom day. If you read through some reviews you’ll probably find one or two restaurants that pop out as your own top choices.
The hard part is figuring out WHEN you want to eat. For first time visitors it’s almost impossible to know what sort of touring day your family prefers! If you’re morning people then an 8 am pre-rope-drop breakfast inside a park can give you a head start on everyone else. If you want to spend 10-12 hours straight in the parks, then lunch makes for a nice break in the middle of the day. If you think you’ll want to take a long afternoon break for swimming or rest, then a late lunch before leaving or a dinner ADR away from the park or after your return works well.
I hope this helps!