Learning from written strum patterns is not that easy. The best way is to watch video covers of the song you are learning on YouTube. I think this is a better method. You will fing there are many different patterns that are used for any given song and you can pick the one that is easier for you. It works.
You can see all my video covers on http://www.youtube.com/bensonp1000
I have finally found happiness in my life. Guitars, singing, beer and camping. And they all intertwine wonderfully.