Sea sand is probably a lot finer than anything you've encountered in your freshwater experiences ... so keep your powerheads off long enough for the sand to settle or you'll grind them to death with all the fine sediment floating around
'Live' sand has bacteria in it that some feel helps start or 'seed' a new tank
If you're going to use true, wet-in-the-bag 'Live' sand then DO NOT wash it
If you're able to mix up your new salt water outside the tank, add the sand first and then slowly add the water
If you need to mix the salt in the tank first then, as reefwars stated, add the sand after the salt is mixed
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