Hello-- should i take one year long AP or 2 semester long AP courses!? Also, how many AP’s do I need junior year?
Depends on what they are.
Depends upon the colleges you are targeting and how many other students in your HS who are targeting the same colleges are taking.
Which would you do better in?
What APs? What’s the rest of your schedule like?
I don’t think that there is any “right” answer to these questions. To a large extent you should take what you are comfortable taking and what you are interested in. There are a lot of universities in the US and if you take your studies seriously you should be able to find an appropriate university when the time comes.