It depends on what you originally selected. You can look at your EIN letters to see what you did.
If you selected sole proprietor, you would use the sch C and it is not necessary until the business begins. However, rental properties go on sch E unless you are providing substantial services like a hotel.
Perhaps, you elected to be an S corp which includes rental properties. An S corp must file every year regardless of income and activity.
If you selected sole proprietor but meant to choose S corp, you can make the election to change.
Please learn more about business options and requirements at the IRS website: Small business