craftgrrl | I need help desperately!

heyhey, im hoping that you girls (and guys?) could help me! im not too sure if this is the right place to ask, but does anyone know how to draw out a pattern for a sleeve? like, what do use to measure out the curve at the top e.g. arm hole of the bodice pattern!? i know i could just cut a sleeve off a top and draw round it or whatever, but i need a proper detailed (is there actually any detail on a sleeve pattern??? :-S) pattern!!!! ahhh i hope any of this makes sense, i know what i want to ask, but im no good at explaining things ^_^

if you can help me, I'LL LOVE YOU!!!! hehe thankyooooou!

*bEtHaNy* <3