This topic is for anyone who has questions about guitar or music in general. I will try my best to help out and answer your questions.
I said to Sniper I'd post a 12 bar blues here, so here it is. The chords to a basic 12 bar blues in the key of A:
This is the most basic structure for a 12 bar. I can post more complicated alternatives if requested, such as some of BB Kings' versions.
You also asked about melodic phrasing when soloing. This is a big area of music which has a yawning gulf of possibilities as no solo is played the same twice. One of the first things to look at with phrasing might be to exercise a four note rule, where you play four notes, and hold the last note played, sustaining it before moving on to another phrase. Doing this will sound simple, but will tell more of a musical story than constantly playing notes. Again, ask if you have any more questions about phrasing!
I would be glad to answer any more questions about this. Cheers
Slow is smooth, smooth is fast