To keep it simple you run your gym like you run your house. Keep it clean and in good running order. No jerks allowed, members pay on time and if they give you any crap, throw them out. There's peace where there's order. ↗
When I was 15, I worked at a dry cleaner because I wanted Abercrombie & Fitch jeans. My mom told me I could have $20 jeans, not $70 jeans, unless I was willing to work for them. So I did! ↗