If I import music from ITunes onto my Iphone, Will I lose the songs I already have?

I was just wondering, I have a bunch of songs on my computer that I want to put onto my phone, But if I do so, Will I lose all of my current songs in the process?

Yes unless those songs are on the computer.

Yes. You have to have them on your computer already (or take them off your phone onto your computer) to keep them.