I think Wapparia meant to type LFS
..as in local fish store.
"Seeding" just means introducing beneficial bacteria from an already established tank. There isn't much bacteria in the water but it attaches to and lives on and in things like sand, sponges, liverock etc. So, getting some sand from the LFS
will help jumpstart your cycling. Your livesand and liverock, if it is actually live rock and not base rock, will also provide some of the bacteria but it takes a little longer to cycle the tank.
Now, just in case
...cycling a tank means to get it ready for inhabitants. It is referred to as the Nitrogen cycle. As things die off from the liverock, and they will due to the transfer, they introduce ammonia into the water. Beneficial bacteria take in the ammonia and convert it to nitrites, then, other bacteria take the nitrites and convert them to nitrates.
You said you are using ocean water..is that REAL ocean water or "made" water? If you are using real ocean water, be very careful. You have to remember that ocean water isn't pure..it may introduce some of the good bacteria you need but it can also introduce illnesses and other issues.