My advice would be to get the basics right first and then go from there....
Today that means...
1. a good cardio area (10 treads, 10 crosstrainers, 6 recumbents, 4 upright bikes as a minimum - treads and the life fitness crosstrainers are what people mainly want to use).
2. a good selectorized circuit - leg extension, seated leg press, seated leg curl, ab machine, lat pulldown, supported seated row, seated chest press, shoulder press, bicep, tricep.
3. machines for chicks like hip adduction, hip abduction, glute - these can be a big selling point esp if you will have girls running the place.
4. area for abs and stretching/functional shit like balls etc
5. some freeweights and specialized machines but only once 1,2,3 and 4 are covered - crossovers, pec fly/rear delt, seated calf, 45 leg press, smith, power rack, cable row, heavy lat pulldown etc... the basics, not specific bodybuilding stuff like decline press and t bar rows.
forget running classes (only 5% of people do them) or even having child care to start with but look into 24 hour keytag access since that can be a big selling point too and saves loads on wages esp on weekends...