Need help with Nero 7 and DVD burning...please!!

Hello
I know you all have explained this many times, but I am new to all this stuff. I have the Nero 7 Ultra Edition and I've heard it's a good program. Can someone please explain to me step by steop what am I supposed to do to burn a downloade from internet movie onto a dvd I can watch in my home DVD Player. i have 6 whole downloade movies in my Shared folder and want to burn them and delete to keep downloading more movies to burn and free memory space. I had bought Roxio easy cd n dvd burning but had to return it because it did not to what i wanted or so they told me that. Nero has so many parts (applications I think) that I have no idea what to do. They also told me download a DVD Fab Decrypter. I did, it's on my desktop . Have no idea either. Please help. Thanks.