Was very brave to post that OP My DP came home last night and said to me, hey my friend has two great chihuahuas he said why dont we get a bitch so we can breed them. Thinks it would be nice.
I pointed out a few things to him that i will point out to you.
Apart from the fact that your dog is waaay to young
Are you prepared for the financial cost? You should get the puppies first vaccinations done, worming?
What if there are difficulties with the birth, YOU dont know what you are doing, blatantly so will you recognise if things aren't progressing as they should? What if it ends up in a caesarian section, out of hours, have you any IDEA how much that costs???
Also, will you vet prospective owners of your puppies? Or do you not care where they go?
What about weaning, do you know when you should do it?
Also, most reputable breeders offer some sort of insurance, are you willing to provide that?
What if the new owners can't keep the puppies for some reason, are prepared to take them on? They would be nigh on impossible to rehome.
What breed of dog are they? Do they have any special requirements?
Im not saying dont breed, that would be very patronising, but unless you can confidently answer all of those questions (and probably more) id seriously question it.
Not everyone who breeds from home is a BYB, i know some ameteur breeders who are very knowledgable and get a lot of pleasure out of their hobby, but you are posting on a parenting forum for advice, which suggests to me that you have ALOT more research to do before you even think of it