If you are serious about it then grab a Physics 101 textbook and get familiar with the subject. Read skim through it and then reevaluate and decide what exactly

If you are serious about it then grab a Physics 101 textbook and get familiar with the subject. Read skim through it and then reevaluate and decide what exactly you need or want to learn. Physics is a huge subject so you need to be a bit more focused on what you need or want to be able to understand where to start.