I would splurge on a bucket of salt. I bought my first bucket of I/O salt for my fisrt tank and now I buy it by the 200g boxload. It's so much cheaper that way, I pay 42.99 for the box. I got the bucket so I can drop the bags from the boxes right into the airtight I/O bucket. I just jeep refilling the original bucket when its empty.
For cycling you need the saltwater master kit. After that when you go to corals then we'll chat then
Ace hardware is your best bet for the ammnonia. About $3 a bottle. Janitorial strength.
As far as rock I'd say a total of 45-50 lbs. You can get 35 lbs of base rock and then the rest in live rock.
The lights you picked are exactly the ones I started my first tank with, and I had absolutely no problem with them. They managed to bleach out a coral on me, so they have some power to them. They just barely fit on the rim of my tank was my only complaint.
If you need the links for anything just ask.
I think you got the basics covered. I can't think of anything off the top of my head that you missed. Maybe a heater ? lol that's all I got