I am compleltely new to the burning of DVDs, so please bear with me.

My friend videotaped a birthday party on his DV camcorder. He uploaded
the video to his computer and burned the whole thing on a double-sided
DVD.(9.4GB) He erased the original DV tape.

I just got that DVD from him. I only want about 30 minutes of footage
from it and burn it to a blank one-sided DVD using my Sony DRU-500A
internal DVD burner.
What kind of programs do I need to do this?

Thanks for any information.