remember keep your head down, chin close to chest will help with your legs floating. Keep kicking with somewhat straight legs, point your toes and kick from the hip, and swim with your arms underneath you, almost as if your right hand brushes your left thigh (not that much, but that sort of idea), those are the basics. Besides that I would recommend watching videos on youtube, watching others at the pool and look into a local masters program, they have every level swimmer there with great instruction.