A few questions

[Guest]

I new to the pool thing. First I can't seem to make the vacuum work. Have all new stuff. What should I do. I turn one skimmer off I have two. I turn the main drain off. Do I filter backwash or what I have tried everything. Second I seem to be getting a lot of dirt in my pool thus the need to vacuum. I thought I was filter sand. I can brush it down and the pool looks great and then a few hours later it's all back again. Any help is appreciated.