#1
Ah sorry for the extremely noobish question, but

I always seem to come by this kind of note...

12b13

Now I know it means bend., but I don't understand how I'm supposed to play both of those notes if they are on the same string at the same time...

help is appreciated by this noob
#3
You fret the 12th fret and bend it up a half-step. Till it sounds like the fretted note on the 13th fret.
#4
You fret the 12th fret, and then bend it a half step, until it sounds like the 13th fret.
I'm still new.