Not a bad start...
For this being your first piece, it came out quite well. The biggest issue that I can see in this work is that the instruments don't sound all that real, but I've commented on a few people's work with this same issue. It's very hard to find worthwhile digital instruments. So no worries on that.
There were a few places where this work just didn't seem to flow with itself, in my opinion. It just seemed that some of the instruments seemed to be fighting each other a bit more than they were flowing.
As well, don't be afraid to add a lot more instruments into the work, as I have to say that to a degree it sounded rather shallow at times. Experiment a bit with reverb more, that can usually bring a bit more life into a instrumental.
The last thing I have to mention is at around :46 there was a glitch in the audio. This could have just been from a bit of corruption, but it distracts from the piece a little bit.
Otherwise, good work man.