Don't rinse it. You probably do want to cure it first though. Curing is the process of coating the sand grains with bacteria. That makes it just heavy enough to help it settle rapidly. When I first added sand to my tank it took over a week to clear (I added 300 pounds).
You don't want to add more than Â½-1" at a time over your existing sand. Put a little more than that amount in a rubbermaid tub or other container. Add some existing substrate or LR
from your tank and drop some food in there. Just enough to keep the cycle going. You need to stir the sand so all of it gets moved around and coated. A small powerhead can do that for you. In a few days to a week it should be settling down and you can start over with a new batch, while you add most of this batch to your tank.