Next time, when you are knitting, the first time you get to the tail, grab it and work it with the working yarn. This will knit the tail into the piece smoothly, which makes it a little easier to clean up at the end. It will already be woven in, so you can just snip it.
Edited to Add: Amy has a video on this. I can't remember which one, and I'm at work so I can't check. But she talks about it how to do it and make it look good. Congrats on finishing your first project! Take pictures and put them up for us!