Your questions is far too general. I suggest you learn these words first, then learn when to use them. The two words are quite different. It is not hard. In what way would you think they were similar?

You are confusing the german "will" with the english "will". werden: I will be there. = Ich werde dort sein. (werden: to be (/to become) something in the future) (The focus is on the future situation.) wollen: I want (/I'd like) to be there. = Ich will (/Ich möchte) dort sein. (wollen: to want (/to intend) to) (The focus is on the intention.)