Masturbation means to stimulate yourself in a sexual way by touching and rubbing parts of your body for sexual pleasure.
Some like to keep their knees bent; others like to splay their legs out straight, and others still like to lift their legs into a V-shape.
The best way to achieve is by edging.
anal You can use your fingers or a sex toy for anal play although a toy is better for deeper penetration.
Take your time, and just feel it out.
You'll find a full array of options at online sex-toy shops or you local sex store.