I can make a few suggestions for you. I would like to recommend some sites to you that I know we all use. Mousesavers (which was already mentioned ) and
www.allearsnet.com. They are both full of information. Also, I would agree w/ DDoll that if you are not planning on spending the entire trip at Disney you may want to stay offsite. Or maybe split it up, a few nights on property and then a few nights off. As far your kids ages, My DD has been going since she was 14 months old and we have always had a great time with her. I would absolutlely bring strollers! AS far as the babysitters, I did look into it once, and I remember thinking it was a little out of my range, but I am sorry to say I don't remember what it cost. Hope I was a little helpful.