No question is stupid!
Without plants, you can base the lighting period a bit on your preference. Most fish will do fine with 5-6 hrs of light. You can go up to 12 if you want to watch your fish all day (& have no algae problem), but the fish also need some dark time to sleep.
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.