There are so many answers for that question- you will find a many of those answers yourself after reading through Andrew's theory lessons here:
http://www.guitarmasterclass.net/guitar_fo...?showtopic=3351As a quick answer- for using your A minor pentatonic you could use the chords:
As a basic power chord approach you could use these chords: A5, D5 and E5
A5-> A5 -> A5-> A5 -> D5 -> D5 -> A5 -> A5-> E5 -> D5 -> A5 -> E5 <and repeat>
(this is a typical 12 bar blues form, each chord represents one bar of music, which is 4 beats in this case)
Or you could use triads of these chords..which would be A minor, D minor, E minor
Am-> Am -> Am-> Am -> Dm -> Dm -> Am -> Am-> Em -> Dm -> Am -> Em <and repeat>
For those example using A minor pentatonic would work well.
However- i'm a big fan of learning the thoery behind these things..so once you have read through the more basic lessons in Andrew's theory board- i suggest you check out this lesson:
http://www.guitarmasterclass.net/guitar_fo...?showtopic=3630