Also what experience do you have with Cichlids?
Just to warn you, breeding cichlids is EXPENSIVE. You would be lucky to break even. But do what you want. I would get a 40 gal breeder and breed a pair of convicts.
Once the Cons breed, you'll need a fry tank at least 10 gal. Then you'll need a grow out tank for the fry. 29 will work for awhile.
Finding someone to sell your fish to is rough.
Good luck