burning dvd from bitcomet

Hi, i am a complete newbie!!! I have bit comet and have downloaded some films for the kids. I am seriously struggling to get them onto a dvd r. I have installed nero 9 (still struggling) i have installed an external dvd rewriter as my dvd drawer is broke. Cannot get to grips with this at all, could someone please please please talk me through the process as i have tried with nero vision and still cannot do it. Just need to know if i have done bit comet part correct and how to burn them onto a dvd. Thanks for your patience with a distraught newbie!!!