Use for 4 pulleys
Without seeing your boat, I think that four pulleys at the bottom of the mast are there to lead all of your control lines to the cockpit.Pulley 1 - jib halyard (line that pulls the foresail up the forestay)Pulley 2 - Main halyard (line that puls the main sail up the mast)Pulley 3 - first reefing line for the main sailPulley 4 - second reefing line for tha main sail.I would suggest that you go to the nearest marina, walk the docks, talk to people, and this will be better than any pictures that you may see.Take a basic sailing course which will help you a lot not only in standing/running rigging arangements , but also how to use it properly and safely - it worked well for me when I first started a few years ago.Hope this helpsHappy sailing