Don't use any crushed coral. If you want a sand bottom, I would suggest something finer. Maybe something a little larger than sugar sized. the larger the grains, the more detritus (left over food and fish poop) will get trapped between them, causing you problems down the road.
You will need rock. You can use all dry rock or buy live rock from the lfs
or an online vendor, but you will need to add that and then cycle the tank. Then comes fish, one or two at a time, with weeks in between so that your bacteria colony can grow to accommodate the bio load, then comes corals.
The canister filter should take a few days to clear the water and then it should be removed.