All breeds are a good breed to buy for a pet, it is just a matter of which one you like the best.
You can't breed it if there is not another animal for it to breed with.
If you are talking about breed of guinea pig, The best breed, In my personal experience would be the Abyssinian. They not only have a cute hair-do but they have a great personality and are really smart! The other breed of guinea pig that makes the best pet would also be the Teddy, although their fur can be a bit difficult to look after.
You can't ... you must have a boy and a girl. So ... buy another, borrow one from a friend, rent one. Your choice.
from at least 12 or 13
you can either breed two mop guinea pigs (or get guinea pigs that have mop in their blood) or buy one
I just turned 12 and I think the best guinea pig to get is an American short haired. they are very friendly and easy to find. Hope this was helpful :]
at about 1
It depends what you like! :) I like Abyssinian's, also Tortoise Shell's and American's. If you look up on the internet for guinea pig breeds you will see all of them there. All guinea Pigs act the same and have similar behaviour pattern, so, I guess, there is no best breed of Guinea Pig.
Depends on the size of the guinea pig and it's breed.
No you cannot.
it depends on its breed.
There is not really a 'best' breed of guinea pig it really depends on what your looking for. Different breeds of guinea pigs don't affect the additude to much, but there can be slight changes such as long haired guineas pigs are not as athletic, and albino's don't like the sun.