Welcome to PSC!
I know that some of the sources come from people like me who submit them, then they are accepted or rejected, then put into a pool that pics 5 per day advantage members vote on.
I have submitted a few, and all were accepted.
One of the biggest things about photoshop is practice practice, and do it a lot. Learn short cut keys, saves a lot of time.
If you can get a tablet, then grab one up, makes life a lot easier.
All you gotta do is start chopping some sources up and enter the contests, then you can also ask in the right place on the forums, and many of the nice peeps here will do what they can to help.
you can learn a lot in here, and grab up an advantage membership when you feel your going to stick around a bit. its kind of like paying a few bucks to learn mega amounts of stuff from some of the most talented people around.
Pull up a chair, fire up photoshop and start learning..
We can tell you stuff all day long, but the best teacher is your experience, and you can get a lot in here. Some will critique your work either in the votes, comments or via PM which can help a lot.
I hope to see you in the contests.. they are free by the way, advantage members get an insite of future contests and can enter earlier as well as larger images, but you can still do it free too if you like. I started free and only recently went advantage.
Have fun
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