To answer one of your questions, if you're diving a few times a week for your learning, have a pool and your own gear, are coordinated and a good learner, have good instructors handy, and a good source of dive buddies, you could get very good as a recreational diver in a year. Plotting out the exact path would be very hard. Best to see how you can practice and learn the best at each point. I would check to see how far you have to go to get access to good technical quality instructors, that could limit how efficiently you could progress.
Throwing class names out could be: Nitrox, Refresher/ tech agency OW, high end buoyancy/trim, Nav, Night, tech agency rec/fundies class, Rescue, Deep, self sufficient/solo diver, Intro to tech. But you would likely benefit from a 5 to 1 ration of your own dives to practice and fine tune each of those, plus pool practice. After you have a base, photo with a simple camera, if interested, could be good to give you a buoyancy and trim critical task, and a fun way to share your adventures.
Welcome back to diving, it is really fun!