New pool owner needs help!

I just don't really understand what the "shock level is". They say get to shock level and maintain, but I can't get to shock level because I guess there is so much algae. I've dumped several gallons of chlorine in and it will probably take several more.

When I vacuum during the SLAM, should I vacuum to waste?

Also when I use the brush on the side of my vinyl liner, it's taking some of the finish off. Scrub less hard? There is never that much chlorine in the pool so I'm not sure why thats happening. The liner is probably 10 years old.
 
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