How to properly vacuum my pool
attach hose to vacuum head, keep under water while you take the other hose end, and place in your pool, over the outlet, so the hose fills with water and all the air is out... then while keeping it below water level. move it into the skimmer, usually you remove the swinging door and the basket of your skimmer, and the hose fits down in. now while keeping the vacuum head under water, place your hand on the bottom to feel if you have suction. if so. you are good to go... go slowly, depending on how bad it is, you may have to go back and forth a bit, but it's not like carpet, ,,, if you go too fast, you will just stir things up.
when done, disconnect, and make sure you backwash your filter.