Pretty good for your first try. But as mystery said, you got to play with the sounds and experiment with different VSTs and MIDIs.
It takes practice to get to know FL. Just play around with stuff and ask around for help every now and then and you'll learn how to use it. I still learn stuff constantly because there is so much to know about FL. I see you just used premade sounds. But we all do in the beggining.
Please contact me if you would like to use this in a project. We can discuss the details.