This is a extremely large topic to large to be explained here i would recommend going to cyberfret.com from there you can navigate to scales. I would recommend you start off with the major and minor scales. Keep in mind major and minor scales can be moved all over the entire fretboard and depending on their root they will give your solos a different sound. Now if you can tell me what music you like i can further steer you in the right direction :D . I know it may seem confusing but scales will really improve your technique and soloing. Dont bogg yourself down trying to learn multiple scales. Doing this will only make it harder to learn. Take it slow. Maybe someone else can tell you a little more in the way of theory than i can explain. :D Good Luck