Dis-regard post #9, I was trying to quote the whole thing not just the first line, maybe it's a limitation on here? Anyway, I'll copy/paste instead so here goes....

Installation - does it include sand and block? How about electrical?
Sand-yes, block-not sure, what is block for?

Liner - Up to you, I think the beaded / J-Hook look nicer - safer, I don't know - sorry.
I like beaded, but overlap seems much less likely to ever come off.

Filter - 1.5 HP may be alot for a 21" sand filter - I too like sand. The advice I've seen here is larger filter, smaller pump. Too much pump can push crud right through a filter that's too small. The slower the water moves through the filter the cleaner it will be.
So, should I request a 1 HP pump instead of a 1.5? Is a 21" filter enough, or should I request a bigger filter?

You will need: a ladder ( do you need code - compliant self closing, latching? )
Yes, latching.

Test Kit - Do yourself a big favor and buy the Taylor K2006 test kit (find links here on pool forum so forum gets a little cash to stay afloat).
Thanks, appreciate the recommendation.

Chemicals - you don't need most of this list and it may cause you trouble with water quality. Read all about BBB on this forum and on PoolSoultions for, what we all agree is, a great way to maintain your pool.
So, should I just tell them to keep all of those chemicals and buy my own?

Cartridge Sanitizer - I don't know about prevail, but these "chlorine free" - "reduced chlorine" systems are unneccessary and could cause problems - refer to the BBB method - it works, you'll be happy, really. -
I definitely will, but is this the same thing as a self chlorinator? Even though it's not listed, I remember the woman at the pool store showing me a self chlorinator that is part of the package. If these are one in the same, then what's the alternative? Those floaty pod chlorine things? Sorry I'm a total newbie. Trying to learn everything, but I'm on information overload right now. I haven't looked into the BBB method yet as I haven't gotten the pool yet, but I definitely will be looking into that method.