Edit:: LOL, DQ, that's why I don't have worms...I tired 'em once and they stank up my entire apartment! ><
Over $500 here...and on my 2nd as well.
You'll need to do a LOT more research before even thinking of attempting to breed.
I feed my new hatched fry BBS (Baby Brine Shrimp) and usually just stick to that. Some others feed microworms, walterworms, bananaworms...
As for tanks... usually a spawning tank is around 5-10 gallons. I personally use a 3 gal, as it's what works for me best.
For grow-outs, I use a 20gal., and have two more spare 10 gals. You'll also need 100+ jars (I have the quart pickle jars used for canning) when your fish (males) get older and start fighting.
Some people sell to Petstores, some sell them online, others give them away- it's really your preference to where you sell them. Me- all my friends at college want at least two each and my local petstore also said they would take in any extras.
Sorry for seeming "rude" in the previous thread. The OP wanted the thread closed and I figured that continuing to post in it would seem rather rude itself...