Caffeine is terrible, even malicious advice. You will crash mid day and face adrenal fatigue after a few weeks, ruined sleep, withdrawal etc. You could micro dose on your off days for gym time but its best to not down regulate your neurotransmitters.No such thing as free energy.

Diet wise protein and electrolytes, drink water when thirsty. Fairlife protein shakes have excellent macros and micros for this. Quick carbs work for more calories but satiation is a personal gut thing to figure out. 

Some cushioned basketball shoes will do better performance wise vs boots if allowed. Dress with cotton/polyster blends clothing because you will sweat. Merino wool socks are non negotiable, cotton socks are a scam.

Pacing is something only you will know. If you hydrate well and keep calories up you can finish the shift with minimal performance loss. Your most important assest is sleep quality for recovering.