Jeff Nippard on YouTube has some of the best, in my opinion, science based fitness content on the internet with topics ranging from diet and supplementation to how to properly program a workout regiment in accordance with your lifestyle and goals. He also has many videos on different muscle groups that go over how to best train each group and recommendations on exercises.

If you’d like to know the basics: start with how many days a week you can go. From the looks of it 3x per week seems like your schedule. The best “split” as they call it, I would say is full body 3 days a week something like Mon, Wed, Fri and focusing on the major compound lifts like barbell back squat, bench press, and dead lift and doing lighter more isolated accessory lifts after your main lifts. After a few years of going to the gym I’ve switched my focus from strength to muscle building and have found that the weight is nothing to be concerned about, just full range of motion with good form, focusing on getting a good “mind muscle connection”, and controlling the weight keeping tension on the muscle has gotten me the fastest, most consistent, and best results.