Contact a company that rents floor sanders, such as Home Depot or Sunbelt Rentals. Decide which type of floor sander (square buff, drum or random orbit) is best for your particular job, and make an appointment to get the sander. Prepare to pay fees if you want delivery and pickup.
If you are screening, coating or providing other types of floor maintenance, consider a square buff floor sander. Refinishing a floor that is old or distressed is a typical job for a drum floor sander. If you need more aggressive sanding, consider an orbit floor sander, which is also easier to work with than the drum floor sander. An orbit floor sander is also easier when it comes to changing out sandpaper grit.
Call the store that has the sander to make sure that it is in stock. Review the information about pricing and deposit, and either visit the store to pick up the sander at the agreed time, or arrange to have the sander delivered to the place where you plan to use it, if applicable. Purchase or borrow safety shoes, gloves, a mask or respirator, and eye protection. All these are necessary for safe operation, no matter which type of sander you choose.