going to disney for the first time: tips,tricks, advice please

Which park

me the wife my mother and 4 kids are loading up in september and going for 7 days. my buddy and his family are also going and he has been there a few times so we have a guide.kids ages are girl 14, 2 boys 11, and 1 18 month old. wondering if anybody had any money saving tips food, tickets ect.. sweet condo is already reserved and got a good deal due to going in the off season. thanks in advance

Disney world in Florida or Disney land in Cali?