Simply go to pallet town and surf south
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You can find Shellder commonly in Route 21, Vermilion City, Cinnabar Island, Olivine City, and Seafoam Islands. You will need to fish in the bodies of water to encounter it in the wild.
Go to pallet town, go south were the water is in Pokemon red and blue, and use surf then keep going till you get there. :)
In Goldenrod city, but only in the Japenese version of Pokemon Crystal.
Sorry to say, but you can't catch Cloyster. You have to catch a Shellder with a Water Stone. You can catch a Shellder by fishing in Olivine City (SS Aqua Entrance), Vermillion City, Cinnabar Island, Seafoam Island and on Route 21.
On Pokemon Silver, Gold, and Crystal Blaine is on Cinnabar Island. On HeartGold and SoulSilver he is at the Seafoam Islands.