Not every venue is going to be able to provide everything for your show. One of the pieces of equipment you might find you need to rent yourself, especially if you hold the show in an outdoor space not designed specifically for concerts, is the stage itself.
You can't just get any stage, though, if your act is a band. An acoustic guitarist or solo singer is one thing, but for a full band with lots of heavy equipment, you need a music stage that can handle a lot of weight and, most likely, a lot of movement.
When looking into a stage, make sure you get one that can safely support everything that will be happening in your show. You do not want to cut corners when it comes to safety, and paying the rental company for damaging its stage will cut significantly into your proceeds.
Next, speaking of safety and property damage ...