I know breeding rats is somewhat financially smart compared to buying rats (Unless you get them from a breeder for a cheap price), but how difficult is it?

I know you need the space, I know you need the proper type of set ups (Rat racks and what not) and I know you need the proper dietary needs (Can somebody fill me in on what they think is the best for the food please?) and the patience and time to actually care for them.

Could somebody tell me how to set up and use a CO2 chamber? I get HOW to use it, but I don't know how to "catch" and what to do with the left over CO2.

Anything else you think that is important that I forgot, please feel free to inform me on.