What all do i need to no about breeding rats??

Answers:
You will need more than one person who will take 2. Rats have several babies, just like other rodents. I think anywhere from 12 to 18. You really should read my link before you even contiue considering breeding your rat. You seem to have no good reason to breed, and I don't think you actually really really do want to.
How old is your rat? If she is older than 8 months, than she could die or become injured during birth. Do you want that to happen?
I really don't think that you should try to breed your rat. It sounds mean, and insensitive to your rat's needs. She never asked to become pregnant did she? No.

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How disgusting. There are enough rats in the world already. You should breed something that people don't want to exterminate.

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you need to know that you can do an internet serch by going to yahoo wich your at and type in rat breeding. gosh people are soo dumb.that will tell you more then anyone on here could type

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why not research it on the internet (wow what a novel idea)
not to be a smart *** however, don't you think their enough rats in the world without good homes.

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PLEASE DONT BREED THEM! THERE ARE ENOUGH RATS GETTING SOLD TO EXPERIMENTATION LABS ALREADY. PLEASE DONT ADD MORE UNWANTED ANIMALS TO THE WORLD. IT IS CRUEL AND UNFAIR FOR THE ANIMALS. JUST THINK ABOUT WHERE THE ANIMALS THAT ARE BEING CONSTANTLY BRED GO: TO ANIMAL EXPERIMENTATION LABS. IT IS CRUEL AND UNNCESEARRY! DONT DO IT!!

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Nothing. Put two in a cage and you'll have a full house.
Ever heard the expression "mate like rabbits"?
Well rats are worse and reproduce faster.
I don't see why you would want to breed rats.
Theres not much demand in the..rat market.
Unless of course you have a pet snake..then I understand your motivation.