http://www.hal-pc.org/~mwsmith2/BleachCalc262.exe
One of our regulars on this board wrote the program. When you download it, save it to your desktop. It's a very small program. You can customize all the settings once you open it. First thing I'd do is in the upper left corner click on "more calcs" and then "settings" and change the units to "imperial" (U.S. units instead of Metric...unless you're more comfortable using metric), then enter your pool volume in gallons. From that point you'll be able to easily figure out how much bleach, etc you need to add to bring your levels up to where you need them. With having practially no chlorine in your water right now and not CYA, you need to bring your chlorine up to about 3 (assuming your water is clear).

Then, my suggestion is to bring your CYA up to about 20 or 30 since you plan on continuing to use pucks. That will get some CYA in your pool and still give you a little wiggle room for using the pucks.