pretty much everything that they said about scales. Major and Minor pentatonic are the essentials, if nothing else, learn those and you can solo to pretty much any song. But, just to re-emphasize... get a backing track, either self recorded or from a website, and just play scales over it. I learned from 12 bar jamming with my friend, and also from an instructional video that showed the pentatonic scale and had a 12 bar progression as a backing track.
Also, make sure you switch things up. For the longest time my solos were dry and lifeless, and i realized it was because i was just playing whatever note came next. Once you're comfortable with it, try some string skipping, stuff like that. Also, don't be afraid to hit a wrong note, sometimes those can be the coolest part of the solo
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tune low, play hard, and floor it!!!






