I do a push, pull, legs split and go 6 days a week. Make sure you get at least 6 hours of sleep a night and get at least 70g of protein a day, honestly go for 100if you can. Doing heavier weights with fewer reps will increase muscle volume (make sure you still have good control and form)
Sleep and diet matter a lot more than you think. If you’re new to lifting, I’d do like 4 or 5 days a week max so you can have time for proper recovery. Push pull legs is pretty easy to manage, do either that or full body (if you do full body workouts maybe do like 4 days a week bc you’re going to be spent). If you want hypertrophy based training (bigger prettier muscles) do like the 6-12 rep range. If you want to bias more towards strength then do the 1-5 rep range. Don’t ego lift, as #1 said
For weights, the reps and weights don’t matter too much as long as the speed at which you can do reps slows down significantly towards the end of a set. Try to increase weights used slowly over time (~5lbs a week or less for smaller muscles). Keep to those and you’ll make progress 👍
Make sure you have good control and form. This isn’t required per se, but I would pair your normal gym training with some mobility and stability training—it’ll set you up to be healthier long term and best avoid a lot of issues lifters can run into later. You kinda have to go off how it feels for your own body and iterate accordingly, make sure you are progressively overloading
Just do 6-12 if you want hypertrophy, more than that is usually just for endurance & not going to as optimally work on building muscle. It depends on the workout, but 3 sets is a generally good rule of thumb. Push= chest, shoulders, & triceps workouts; pull= back & biceps, legs= legs & abs. You just rotate these days with a rest day in between. Ego lifting is compromising on control/form so you can feel better about yourself as you hurt yourself. YouTube will be your friend, use it to learn!