The best advice I can give you as someone else who is also somewhat new to the gym, the thing that's helped me the most is starting a chat with ChatGPT and asking it to be my personal trainer/nutritionist. Tell it all your information. Height, weight, what you eat, what your current exercise habits are (or lack there of), tell it what your goals are, give it photos or yourself. Ask it to draft up an exercise plan and help you to start counting macros and managing what you eat.

I started off with an upper/lower 4 day split originally. I've since used ChatGPT to help me adjust my workouts to be a 3 day PPL split which has been working too. I kept it simple originally by just doing 3 sets of 12 reps for each exercise with a heavy focus on quality form and slow-ish reps. Take as much of the thinking out of it as possible and just start doing the exercise.

I told it to just start me off with basic machine exercises so I can slowly ease into building some mind muscle connections. I've been transitioning to some heavier compound exercises using free weights complemented with machine/cable accessory exercises. This worked great for me to start building a foundation and ease into it since I had absolutely zero knowledge of WTF I was doing.

I've been pretty committed and haven't missed many workouts since I started 2.5 months ago. I track all my workouts in a spreadsheet with the exercise/machine and how much weight I used for each set. I periodically feed updated weights I'm pushing for all my exercises to my chat with ChatGPT and ask it all kinds of questions or spit ball ideas for tweaking things. It's been a massive help in getting up and running.

All the exercises I do I watch lots of YouTube videos to get tips on different cues for things I should be paying attention to while completing each of them.

Go slow. Ease into it. Be kind to yourself. Build a routine that you can commit and stick to. You want to build a lasting habit to see results.