You want to aid for 1 lbs per gallon for both sand and rock. You will want to look into lights, as it is the most expensive part of a reef tank.
The taotronics LEDs are the best for your money and will cover 2ft of tank length.
The canister filters can work in saltwater, but we normally will aim towards a sump for extra equipment as unkept canisters lead to nitrate traps and reefs aim for pristine water.
Just wondering, when you guys advise the 1 lb per gallon, do you account for displaced water? Say I have a ten gallon but only 7 gallons of actual water volume when I have ten pounds of LR?
Anything close to that number is fine. The most rock you can fit and the tank still be aesthetically pleasing and functional is best. You don't want so much rock in the tank that there's no swimming room or you can't achieve proper flow.