How to put old iphone on new computer?

I had my iphone hooked uo to my old computer back home but i now went to college. I used the old computer to put music and all that on the computer. Now i have a laptop here at college and I want to put music on my iphone but i can't put any music on the phone i can only listen to it.

How do i hook up my old iphone to my new computer.

I could care less if it erases everything on there as long as it lets me put music from my laptop on there.

That's what you have to do. You tell iTunes to initialize your iPhone. Now you can use the iTunes on your laptop to manage your iPhone.