There are so many threads on this subject, just type in "vhs to dvd" in the Search box (on the left of this page, not the one at the top of the page), you should get somewhere around 18 threads covering this subject, far too many to post links.
But before you do that you would need a DVD Rewriter and some sort of capture card/unit. I use the Pinnacle Fusion USB capture unit. Have a look here: click here
The Pinnacle Studio software that came with it wasn't very good though (it has sound sync problems) so I now use Sonic MyDVD software instead.