I just got certified for scuba diving (opem water) with my school and we rented our wet suites from scuba emporium. I would like to know if I could personally rent equipment from there if I ever go somewhere and I wanna dive. If you can how much is it.

I assume you mean the shop in Chicago? I don’t think I’ve ever come across a dive shop in 20 years of diving that doesn’t have rental equipment. If for some reason they don’t then just rent at another local shop. You just need your OW C card and a method of payment.
Typically, for a BC,lead,tank with fill and a suit will set you back about 100 bucks over a weekend. The rest of the gear you already ought to own having taken the course..