Find and insert any drain plugs in the filter and pump. Set up the valves to allow proper flow (you might get it wrong at first, but play around and you should find out the right settings). For now just get it on recirculate and make sure the pump is able to run correctly. You might dump in half a gallon of bleach just to keep algae where it is until you get the test kit and can start SLAM.
Also make sure you have stuff you'll need, like leaf rake, vacuum, and bleach. Once test kit comes the real fun begins. For tomorrow just get the equipment running.