As a general rule, it's always better to go slowly when you're adding chems to a pool--it's better to sneak up on your target number than it is to overshoot it! In your size pool, I would start with no more than 2 cups of muriatic, add it with your pump running (I usually just pour mine slowly into the return stream to help it mix), wait 2-3 hours, then retest and go from there. Be careful with the acid, because it's nasty stuff. wear gloves, glasses, and make sure you stay upwind of it. I usually hold my breath while pouring it-- it only takes inhaling the fumes once to make you understand why.
Your numbers aren't as far out as you think they are--with frequent backwashing/partial drains, your CYA and your Ca will come down to "normal" in no time! As far as maintenance schedule, mine consists of testing ph and Cl every couple of days, testing everything else about once a month, and adding bleach as needed to keep my Cl levels up. I shock after a heavy swim load or storms.
Get a good, drop-based kit. WalMart sells a decent beginner kit for about $15, but the kit Ben sells on this site is top of the line and is what most of us use. As an alternative, Taylor puts out drop-based kits that are similar and that can be found at your local pool store. In order to properly maintain your pool, a good, reliable test kit is an absolute MUST!
Welcome to the forum!
Janet

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