will syncing my iphone delete its data?? plz help?

[Figi713]

so i got a new computer because my other one crashed, i have an itunes account, but i buy all my music and everything straight off my phone.
so the itunes on my new computer has nothing on it, and when i push sync it says it will delete and replace with whatever is in this itunes account, which is nothing. sooo will all my music and pics and everything be gone??
how do i transfer the music?
i said manually do it, but it asys it will replace my music agian
plz help idk what to do

 

[spectrawolveress]

You have to authorize your new computer before syncing your phone, otherwise you'll lose the data. Here's how to do that: http://support.apple.com/kb/HT1848