i dont' recommend any generalized public speaking course unless public speaking is some sort of major issue for you
i came into law school semi-nervous about it as i didn't have a lot of experience with it
trust me - you get the experience whether you want to or not.
1L classes are generally socratic (and mine are heavily so). this means on day 1 of fall semester some poor sap(s) is getting grilled on the first reading assignment. you will get your time in the sun - everyone has their time - its just matter of when and how often. on top of speaking in class, you will have mock trial and moot court opportunities. these obviously entail public speaking in a high stress type environment. also, most 1L curriculums involve an oral advocacy class. in our class this semester, we have given a total of four oral arguments in the classroom (along with 2 memos).
there's no point in attempting to "prepare" for the socratic method. its something that all 1Ls generally suck at and improve upon as the semester and year goes along. you earn no credit or poitns for your performance in class. there is no reason for you to go out and train yourself to be a socratic star unless you are gunner McGunstein himself, in the flesh. i wouldn't worry about these things - you will pick it up as you go along - this is the point of law school (the point isn't for you to learn these skills on your own before you even start law school....)
now if you are absolutely terrified of public speaking (as many are) i suggest you take a toastmasters course or somethign along those lines that might help you ease your fears. generally speaking your 1L professors aren't going to ease you into anything - and this includes the socratic method. come to class on day 1 ready to go ...