Turning my algae farm back into a swimming pool

[mobilemike73]

Hello. Late last summer I was hospitalized and ended up leaving my newly installed pool unfiltered and unchlorinated from August until now. Needless to say it's a mess and this weekend I am planning to work to take it back so we can start swimming. It's a deep dark green.

Pool Details:
10,000 gallon above ground, vinyl liner, 22' Round
100lb Sand Filter
2HP Pump
K-2006 test kit restocked with new solutions one month ago

I have started circulating the water and am first adjusting pH to 7.6 before doing anything more. My next step is to start adding chlorine and continue testing as well as adjusting water quality to maximize results. I tested for CYA and the test water was barely cloudy and is lower than the minimum measurable level on the k-2006 test. I would appreciate any advice offered but here are some specific questions I have regarding my situation:

1) What's the highest level of TC/FC I can maintain without damaging the vinyl liner? Will CC affect the liner or just FC?
2) Should I add some CYA immediately or wait till the water is cleared?
3) Will my sand filter be able to clear the water or am I going to have to shut down the filter for a few days to let the particles settle and then vac out the debris?

Thank you very much for any and all opinions.

Mike