OK here goes I will try to be as gentle as possible here.
1. open nero vision express and select make dvd video from the top icon.
2. click on add files from the top right corner and slect the file it is you require to burn. or more than one file ect.
3. these files will now load to the screen, if the movie is 1 part you can click next or if it is two parts you need to merge the files. dont worry this is easy. press cntrl and a and the files should be highlighted. In the bottom left corner there is 3 icons the top to re-name the files the middle to merge and the bottom to remove. click the middle these files now become one movie. click next to proceed this will take you to the menu screen.
4. Menu's. Ok to begin with siply click on one of the default ones and add the name when you get better you can animate this and add clips from the movie ect. by clicking edit menu you really need to play around with this to figure it out but the buttons are self explianitory. click next.
5. A menu preview screen will appear. click next.
6. you are now ready to burn your movie at the top right there is a select device icon select the dvd burner. go down to burn options and select burn at once, determine max speed and write.

OK click burn and you have your movie!!

P.S. before you burn you should click on more go to video options and select the format region you need(i.e usa ntsc uk PAL ect.) click dvd video and select the speed ect high quality very slow super extended play very fast but can be very poor if you dont have an audio plug-in.

dont think ive missed anything so enjoy your movies

hope this helps