I'm not a photography expert by any means, but adjusting your photos i would say is ok. Just don't overdo it. If you don't think you have an interesting subject, take pictures, but don't expect more from them than what they really are.
Learning Photography
a quick google search pulled up that article, maybe it will give you some insight.
Don't be afraid to take a shit-ton of pictures because you think they might be dumb, but don't get discouraged that someone SAYS something is dumb. Photography is by no means easy, anyone can take a picture, but it takes an artists to produce something people will want to look at. Look at it as an artist, not as a picture you want to take.