All you need is the pentatonic scale, learn the major and minor shape and how relative positions work. Know the notes on the neck and in your scales and then you are set to play. Every other scale is just icing on the cake. If you really want to look at more then look at the 8 note dominate scale, realize its the combination of a major and minor pentatonic scales and that you don't need to know it separately from them. From there I would say learn the 5 major scales so that the neck is organized in C, then learn about modes, then rock faces. (I only recently figured out modes and am relearning the neck in C major scales so I can play mode-ally).
I can teach you all this for the most part if you want. The real learning will come from playing with tracks though.

*side note: I played Smoke On The Water last night while I was trying to come up with an original solo to it.