Okay so if you want natural waves you can braid your hair :) a few ways:
1.) braid your hair into many small sections and secure with rubber bands to get tight waves
2.) Put your hair into a high ponytail on the top of your head. Bend over and braid loosely or tightly depending on if you want tighter or looser waves. (This will give you bigger waves no matter but if you braid it tightly it will give more of a crimped style)
3.) French braid your hair to get light waves from about the middle of your hair to the bottom. (I do not recommend this for girls with thick hair because only some on the top of your hair will be wavy and the rest will be flat)

A few tips :)
1.) Spray your hair with a bit of water to help your hair mold to the style.
2.) use a bit of mousse of leave in conditioner to help your hair to stay in place of you don't want to use hair spray.
3.) use a straightening iron to quickly make your hair mold to the style (this can be useful in the mornings of you want a quick and cool hairstyle)
And that's it for right now :) message me or comment on this to tell me what kind of hairstyles you want to know about :)