TSK...here's a link to a 3 part series about mastering Photoshop.
I would suggest though, since that program is pretty expensive (altho great), I'd listen to Zubaz and start simple. Paint.net is free but a PIA. The Gimp is a PIA also.
It'll boil down to putting up with something less than optimal unless you're strongly motivated and/or blessed with extra bucks.
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