If you have one of the latest versions of Nero (>5.5 IIRC) then this will be able to author a DVD. Many of the editing programs can also do everything from capture to DVD authoring - what program did you use to get the footage onto the PC? If you just used an old program without DVD authoring, or even MS Movie Maker (this does not have DVD capabilities) then you can buy Nero or even better a dedicated DVD authoring program such as Ulead DVD MovieFactory (you can get a free 30 day trial from
Here) and this will cost you around £30 to buy.
These programs will do all the work for you, so no need to worry too much about conversion and correct ways to creat the DVD. I haven't used Nero to create a DVD, but do use MovieFactory and it is very easy to use and gives very good results.
So you have a few options and which way you go depends on what software you already have.
Good luck,
Mark.