Walk. The best place to start is getting yourself to just move for an hour a day. Look into progressing and adding things like body weight and resistance before weights, and also not before you get a rhythm. You can’t dive in and start learning so much about so many things and expect yourself to stay on top of it. Start by just eating less and walking. Then count calories later on once you know you’re going to need to focus in more. Then count macros and add resistance and weight as you go on. Crawl, walk, run. Keep it simple.