Going by your questions, I think the best advice you can be given right now is 'don't sweat the small stuff' joos. You're overcontemplating everything. Thinking is usually good but you need to remember that it's always the big picture that matters most (as in 99.99%). Just make sure your training is working, work on that mind-muscle connection and make sure you're eating a sufficient amount of calories and protein to grow each day, rather than looking at it from a pre-workout meal or extra calories on lagging body part days perspective. Those are things you can get your extra 0.1% out of later but it doesn't matter for now.
You can't sculpt a pebble.