As other have said, you can't and shouldn't use your dog to flush deer.
By that post, you seem to be a rookie when it comes to hunting dog training. There's a lot to learn!
I'm shure if you stayed on top of your training your pit bull could be a good hunting dog. I haven't seen one used for hunting before, but I'm shure it's possible wit a lot of work and dedication. You already have the dog, so you might as well make the most out of him. Your dog will excel in certain areas, focus on those first.
You should start off by doing a lot of reading. I have a DK so I most of my research was focused around that breed but I'm shure a lot of it could help you out.
Check out
http://www.navhda.org/ and I suggest you get their "Green Book" from here:
http://navhdastore.org/
You'll probably find a lot of help on this forum:
http://gundogforum.com/
I've bought some gear off here:
http://altmoor.com
I bought the Drahthaar Puppy Manual from them, there's a lot of great info in it that focuses on DD's, but you could probably also use it for your pit.
Also, look into force fetch.
There's a lot more good info out there, this is just some of the stuff I've read and looked into.
Good luck!