Your not going to make a living off of it unless you go big. Most of us just do it on the side. If you are lucky, it pays for itself. The costs add up quick. Food,vit's, vet bills, lights, electricity, caging, substrate, more food, etc. shipping supplies etc.
When you only have one or two, you just can't imagine how much more it would cost to have 100 babies, not to mention all the ones you decide to hold back and the others you get to breed back to them etc....
One thing that has really hit me is how much poop can be in a bin of 10 7week old babies. (just from a couple hours) You literally have to sift at least 2 times a day. I'm not talking a couple scoops LOL,,
It's more work than you think & unless you really love these guys you can get burnt out.
I think if you wait 2yrs, you should know by then if it's something you really want to get into. (I waited 2yrs)
Good luck in your quest.
Joel R