Hi guys, I am new here and have a lot of questions. Would really appreciate it if you guys would help me out or refer me to threads that could. Well right now I am a college student and this will be the first credit card I will be applying for. I've recently been looking at the coin for mileage idea and have some questions.

Would a first time applicant and college student be accepted by cards offering these miles, such as chase preferred or starwood?
Is it okay to strictly use these cards for coin purchases?
How often and how much do people usually purchase(coins)?
Will doing this lower your credit score?
I read somewhere that having a lot of cards will be bad for credit reports?
What happens if a CC company finds out you are doing this?
Are miles transferable between different CC companies?

thats all i can think of for now...
im sure ill have more later on..
thanks for the help!