You can either use bleach or dichlor. With such a large volume pool, it might be easier to use dichlor so you won't have to fool with so many empty bleach bottles. Dichlor will add chlorine and CYA at the same time. It will also drop your pH, so you'll need to watch it closely and add Borax. You do NOT want pH to drop below 7.0.

With no CYA, a shock level for your pool for now would be around 10ppm of chlorine. It will take approximately 4 lbs. of dichlor which you can add slowly to the skimmer while the pump is running. Make sure there is nothing else in your skimmer when you add it. When you buy dichlor, make sure it is only sodium dichloro-isocyanurate and not a mixture with other things such as copper, alum, etc. Sam's Club sells PoolBrand dichlor which doesn't have a bunch of other junk in it. Keep your pump running 24/7 and watch your filter pressure.

Test a couple times per day and each time add enough dichlor (or bleach) to get back to a chlorine level of around 10ppm. By the way, in your pool, each gallon (4 quarts) of plain unscented 6% household bleach will add about 2.2ppm of chlorine.
(For every 10ppm of chlorine that dichlor adds, it also adds 9ppm of CYA. So, you'll have to stop using it after awhile and swich to an unstabilized form of chlorine. But, for now, it would be a good choice for shocking since you have a large volume pool.)