Hi Joyce, I have looked at some of their stuff and they use a lot of power chords that is 5ths e.g. E5 A5 etc etc If you are not sure how these are formed they are often only two string chords the key and the 5th of the scale: here are a couple of charts that might help
[img size=400][/img]http://i32.tinypic.com/k3ukgh.jpg
[img size=400][/img]http://i29.tinypic.com/j63f3s.jpg
In case you don't know how, highlight the url's above then right click and select "Copy" then right click in url address at top of browser and select "Paste" then press enter
If you look at the transposition chart and lets say you want to play a E5 the notes would be "E" and the fifth...look along the E line on the chart and its a "B" so E and B make E5 (Open bass E plus B 2nd fret on A string.
There is also a picture of the fretboard and what notes are where.
Fenderphil