Insulation is VERY important. If not done, you will be fighting condensation forever. Are you putting up sheet rock, T111, plywood or pressboard? You’ll need to figure out where you plan to put a sink, maybe a shower for your get togethers…so you’ll need to run water lines. A closet for a water heater, heating unit and electric panel. AC going to be wall units or combined with your heating system? Workbench area is going to need outlets. Also outlets for bar related items and trickle chargers/battery tenders for your toys. If putting a ice machine and fridge, I’d run multiple home runs so you don’t have a large demand on a single breaker. Ceiling fans/lights. Also I’d definitely recommend LED lights above the work area and dimmer switches for the lights in the bar area.