You sir have just started this very long but amazing journey in photoshop. I bet you look at some people sigs and graphics and think, "damn I wish I could so something like that". I used to think the same back when i started, and now a member said that they want to be as good as me :p Don't think of photoshop as a daunting task that you must master in a week or even a month. It takes time, effort but most importantly patience and the enthusiasm to try new things and to step out of your comfort zone. Here is my suggestions:
Have a look on the NGU tutorials sub-section for beginner tutorials. Don't try to run before you can crawl :y:
Also check out deviant arts and search for beginner tutorials. In time you will gradually pick up tips here and there and will end up coming up with your own unique style. And I can tell you now, your first piece was better than mine :L
Look. My first ever attempt at a proper sig:
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And my latest:
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If you have any questions quote me back or PM me. I'm always here to help :y: