#1
alright I know a decent amount of theroy, im not a master by any means, but im terrible with timing and time signatures. My question is how do I find out bpm im going? Also if my song is a basic 12 bar blues that goes E7, A7, and B7 I can just use the E major blues penatonic right?
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Holy Knight of the Crusading Order of the Stratocaster.

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#2
Syncopated tunes in 3/4 time can really sharpen you're counting/timing. Use a metronome to find your BPM.

as for the 12bar - Gmaj Pentatonic might work better. But the rule is: If it sounds good do it. :-)
#3
If you get an electric metronome you can usually set it to what time signature you have in what you're playing...i find it helps a lot to be able to switch it
#4
I would use E minor to get that "ballsy" blues sound. If you use Emaj it would sound too bright.
In blues it's common to use major chords and solo in the minor scale.
All you need in this life is ignorance and confidence, and then success is sure.
-Mark Twain