Here some tut on sig basics
http://iceydragon11.deviantart.com/a...sics-109134683
http://alpine.brainkiller.be/Resourc...techniques.png
Read these and then look at your sig and you if you learned you should be able to tell whats wrong.
Since your new my advice is to look at as many tuts as possible. See what effects you like and try to freak them and make them your own. Try and find a nice grove and work it. Then when you feel your pretty good, branch out.
Also never delete your sigs. If your working on something and you don't like how its coming out. Just save it it can try coming back to it at a later time.