Tigre is a "newspaper puppy", apparently you just bought him on a whim after seeing an ad in the paper. Do you know ANYTHING about his parents? His pedigree? Do you even know enough about the Pit Bull breed to be able to breed towards its improvement?
What is so great about Tigre that will make people with quality bitches want to breed to him? There are hundreds of wonderful champions out there, with excellent temperaments, health and lovely lineage to boot, that are available at stud. What would make someone use Tigre, over one of those dogs?
I just don't see how you can consider doing something like this.. Especially when he is still just a BABY! For gee's sake, enjoy your puppy and leave breeding to the experts!