I'm not a single parent either but h isn't keen on Orlando, so for the past 6 years I've been taking the dc by myself. First time dc were 2,6&10. It was fine.
I prefer staying on international drive and using the I trolley and the hotel shuttles to the parks rather than drive.
Make use if the fast passes where free and consider them for places that charge. We go the last two weeks in August and after that first weekend it gets quieter as I think all of the American children have gone back to school by then.
There is so much to do everywhere accept that in two weeks it's impossible to do it all. Plan the must do and do those and then be flexible for everything else.
Skip discovery cove. It's expensive and not worth it. Especially the dolphin 'swim' (15-20 seconds actual swim)
It's very casual, we ate on the way home from the parks, we'd get off the I trolley where we saw something we fancied. It's much cheaper that way too. You don't need to change for dinner it's all shorts and tshirts you'll probably feel overdressed in maxi dress etc.
I hated it but the kids loved chuckee cheese. It's a pizza restaurant in the middle of an arcade but was ok and kept the dc entertained.
Make sure you schedule in more relaxing days at the water parks as there is a lot of walking and it's nice to spend a day floating down the lazy river etc.
Kids favourite is aquatica, we find wet n wild a bit on the rougher side to be honest.
Relax stick to the tourist areas and you'll be fine. It's so busy everywhere and lots of people will chat in the queues etc.
Have fun.