I’m 15 but I’d go with my bro who’s 18 and already has a membership. Could I get a rough estimate? Like start-up fees and what not. I don’t really want a personal trainer. I just wanna go and have access to different types of exercise equipment.

Not much. Bally Total Fitness is about as cheap as it gets. A few years ago it was 18 a month, but I’m sure this has changed. Ask you brother what the cost is. Usually gyms give discounts to members family members, so you might be able to get it pretty cheap. Most gyms cost right around 50 bucks a month on average, so anything less then that is good.