Don’t worry about the routine, or how many reps before you worry about form. The most humbling and gratifying aspect of lifting can be learning you need to fix your form. You’re humbled because you still don’t know everything, but at the same time excited because you should know the higher weights and better routines will come with better form.
Just remember to lift right before you lift a lot. It’s better to lift small than lift big and blow something out. Have a great day.