To answer a few of your questions: English Bulldogs do not do well in heat. If it's too hot I wouldn't allow more than 15 minutes in it. They also do not do well in cold weather either. Also for training they are a little stubborn ao you will need to be more firm but I have noticed they are very smart and they do know what's right from wrong- but again stubborn. Haha socilization is good for any dog so that is a plus, as far as excersize they don't need much and they get tired really quickly. Vet bills can be pricey as Bulldogs are known for very bad health problems but I know a lot of people who have been lucky so it's a toss up. And I feed mine fromms with the flavor salmon tunlini. A lot, I mean most, recommend this food on here. It's awesome and I would never feed them anything else.
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Also, welcome to the family!