Hi Feygan,your best bet would be to go to the seashore at a spring tide when more of the beach will be exposed,as razorsclams are found further down the beach, what to look for are holes in the sand that look keyhole shaped,plus you can sometimes see a spurt of water coming out of the sand as you walk along,this is caused by the clam shooting down into its burrow. To get them out is just a matter of carrying a tub of salt with you,when you see a hole just pour a load of salt down the burrow and the clam will rise to the surface,now grab the clam but don't try to pull it out to hard as it will disappear again,if you hold it until you feel it start to relax then out it will come,next simply cook and enjoy!
Hope this helps.