To the OP:
There are basics that you must follow, or you'll be wasting your time.
Doing something is better than doing nothing.
Be consistent : while you may never become Arnie no matter what you do, you'll never be anything other than the current "you" with a session every blue moon.
Therefore, pick a system you can stick with (you can always change it, if and when you get more enthusiasm, knowledge, results).
Sort out your diet. You cannot out-train a poor diet.
Good technique ("form") will ultimately get you better results more quickly, with less risk of injury. Get some initial tuition (there are some respected people on YouTube, if you don't or can't get a gym or personal trainer).
Avoid "ego lifting". Throwing the weights around achieves nothing, and increases risk of injury.