Too short.
The song was way to short to even begin to critique. Although, if this was the beginning of a song, I'd say: Start with the bass, not the lead. Also, the lead and bass isn't quite enough to hold a song together, add some drums or something. I too am just trying to start using FL Studio (8) so don't feel bad, this was good for a first try. Don't forget making a longer song is as easy as repeating one beat with almost negligible variations.