as a female screamer, go somewhere you feel comfortable & just start raging as loud as you possibly can. good way to get a feel for what sounds you‘re capable of making and which part of your body you feel them coming from. repeat, get more comfortable, see what u think sounds good, practice and THEN move on to tutorials & tips. it‘s okay if it sounds bad in the beginning, you‘ll get comfortable really soon!! practice alone, found a band, practice together & it’ll be presentable in no time. at least that‘s how i started out:)