>>285429>snorkeling to catch sand crabsI hope you're kidding, there is no way you should catch the big sand crabs.
If you mean the ones that are the size of a baseball or softball, those are practically useless for the type of fishing you're trying to do, and it also seems like a big hassle.
To get sand crabs, get something that looks like pic related. What you gonna want to do, is first look for them in the skinny, and the skinny is basically ankle to mid calf deep water. Sand crab beds will look like Vs that point to shore.
You get your metal bucket with holes, and scoop 'em up. The holes will let the little sand crabs that are useless go through, while the small to large sand crabs will stay in the bucket. Basically, if you have mostly small sand crabs, you pin multiple onto a hook, and if you only have large ones (which are around the size of 3 quarters) you only use one per hook.
Next, rigs, you gonna want to use a carolina rig, with a 12-18 inch 8-20lb fluorocarbon leader, look it up if you don't know it.
sinkers, you gonna need anything from 1/2 oz to 2 oz egg sinkers depending on conditions, if there is little to no current, you're fine throwing 1/2-1oz sinkers, but if the current is heavy, or you want to get your stuff out there, throw the 1 1/2-2 ozs sinkers.
Your main line, on your reel, should be 8-15lb monofilament, 8 works good on a light setup, I prefer 12 on most my setups. Once you get better, you gonna want to switch to braid, and for braid you use 20-30lb green colored braid of your choice, will help you cut through salad (kelp).
For reel and rod, you gonna want a rod that is somewhere around 8-9 feet, a 7 or 7'6" rod gets the job done, but the 8 or 9 footer will help your line stay above the water, and will help you cast farther. The rod should be medium to medium heavy with a fast action, and should be able to throw the sinker weight I stated earlier.