Not bad for a first! I think you could do a lot more with it. Only rating low because it's very short.
If you ever need music resources, you can check out my profile. I try to do my best to help independents as much as I can.
Anyway back to the track, you have a solid lead riff. It works fine. I think you could have taken a basic song structure you found on the internet and broken that down (like say what happens in a chorus, usually all the instruments are in and so on, whereas on a verse you might just have the percs and riff)
You can take that knowledge and apply it here to your track to make it more interesting and dynamic. Don't let that fool you into thinking you didn't do a good enough job. This is your first music! Keep going and I have no doubt you will go onto great things!