Great start, regarding the salt - if you're going to be collecting your own NSW you won't need this, if you're making ASW I seen there's a cheap 20kg bucket of marinium branded salt on trademe up your ways, I've heard good things about it especially considering the price.
The eggcrate is generally used instead of a media rack to keep all your different type of media spaced apart allowing maximum flow through still, you will need either one if you plan on running purigen and some sort of carbon which most people generally use.
The api master reef test kit is a waste of money, you should have just got the saltwater test kit, reefsmart had these for a super low price last time I looked, the tests that come in the reef master kit are pretty useless and are not considered accurate enough for a reef tank especially when it looks like you are planning on dosing for sps type corals. Salifert is the brand you want especially for your Calcium, Magnesium, Nitrate and Phosphate tests.