First, figure out how much money you will spend on these hamsters monthly, or yearly, by feeding and bedding them. Then decide how many baby hamsters you are expecting, approximately. After that, decide how much money you need to sell those hammies for to break even, or make a profit. You have to consider your customers. Who would be your customers? The local petshop? You must understand, anyone, anyone, can breed hamsters, mice, and rats. And with you doing hamsters, your buyers are restricted to the pet seeking crowd- if you bred mice, you could also possibly cater to those looking for live food for their snakes. So you might find out that your baby hamsters are not worth anything, or not worth enough to offset the cost of feed. There is the slim chance they are, however. So, go to the petstore, or a few of them, and ask if they would be willing to buy hamsters from you in the future. Ask them how much they would pay for them. Then decide if you still want to do it. If you can find enough demand for your hamsters to offset the cost of their food and bedding and such, then go for it. You must remember that what you are proposing is a buisness. And you must treat it as such, otherwise it will go awry.