It's not BAD for your first song, but I'm going to point out some things that don't really go together properly in this tune.
- Your melody is everywhere, and changes tempo randomly. It sounds confusing.
- It sounds a little out of tune and notes sound like they're scattered everywhere.
Work on those first, and come back with what you've got. Like I say it's not a bad try for your first song, but can be improved. +rep for trying ^_^ I need to spread some reputation first!