Welcome!!!!
Graduate of USC Engineering School 1981 here. What part of SC are you from? We are in Oconee County, which is very pretty except for being so close to that nameless place (Thanks Coach Horn).
We are pretty much in the same boat as you with three boys and a DW who teaches Middle School, so we normally have to go during the summer months also, plus we can't interfere with football season either. We will be at WDW in early July this year. Last year we were there for our then DS10s first trip. The last time we were there she was pregnant with him so it had been a while for us also. We plan to be back more often from here on out.
Have fun planning your trip and as others have said, feel free to asks lots of questions on here for ideas and suggestions. There are lots of helpful people willing to help.