New owner installing used AG pool; walls up about to tackle liner

[ksand]

ok on the 24 ft round 52 inch deep pool my sons friend gave us, my new liner came by fed ex, we have the rails and walls up, the bottom in, leveled, tommorrow we are about to tackle the liner....we got the overlap kind, ANY TIPS would be appreciated! I need to know also about hooking up the pump and skimmer, we really wanted to do it with pvc, but not sure what we need, I also have bought filter sand to replace the sand in my filter (I don't want headaches from what the guy before me might have had in his pool filtered thru his sand) not sure how to replace sand, no directions or paperwork came with pool. It has a Pentair 1 1/2 hp pump (its only 3 months old) he forgot to unhook and drain last winter and it busted, he bought new one, ran it for a month and decded to take pool down and get an in ground pool put in. (Lucky me) we have well water, I ordered the ultimate start up kit from In The Swim, cause it has some metal free stuff in it that makes well water ok, when I start adding water when do I put chemicals in, its gonna take about 2-3 days to fill pool, don't want to get algae first thing,,,so do I add chemicals before it gets to skimmer level? I have NEVER had a pool and am pool stupid, but want to do this right!!! Please any suggestions would be greatly appreciated! My husband is ready to kill me!!:LOL!!