New to the sims and have a few questions

[Dal]

Hello, as the subject says...I am new, never played the game before but this caught my eye.
I have a few questions i hope can be answerd

1 Is there a pre-made community of AI players that my sim will join?
2 Is there max - min amount of AI players that can live in this community?
3 Can i edit (change names,faces etc) these people in the community?

Just a few questions that i have
(AI of course means Artificial Intelligence)

What i am getting at here is, i'd like to change all who live in my community to real people's names and such. Friends etc.

Im sure more questions to follow