Leave it, don't talk to your sister about that. If my brother (2 years older than me) watched me masturbate and then came up to me and told me how to, I would be disgusted and probably wouldn't talk to him for weeks. My brother and I are super close but getting that close is disgusting.
Another thing, is you're not a girl, therefore you don't know the right way to masturbate for a girl, unless you have a vagina, but with you dumb question, you just might. The only answer is seek help for watching your sister and go back to school to learn how to spell the word.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.