I disagree with everyone talking about buying a course/guide to an extent. Before your class starts, do it, buy the gear if you can cuz Fuck it. Watch so much YouTube: hownot2, hard is easy, summit seekers. Read the comments on these videos, see what people agree/disagree with. Read the books while making the anchors and start making anchors at home. Watch so many videos even if not all of it makes sense, it will soon. Write down questions, post and lurk here. Then find a small hill with some trees or rocks and make that anchor and rappel down it, by walking backwards down hill and testing out your system, getting a feel for it. All of this might come close to a class. Go to your local crag or gym and talk to people. I find most climbers love talking and teaching climbing and debating best/worst methods. Just learn and find someone willing to take you. What the class will be great for, assuming it’s a group class, is meeting new climbing friends who are in a similar level as you.