I use snap on pry bars mostly, I used to use those cheapy mini folding shovels but after trashing 4 of them I built my own out of rebar and heavy steel plate. they don't argue with the blue clay or rocks.
rarely do I use a hammer they tend to break things that are fragile. I bought a dive knife with a blunt tip and one that has razor sharp blade on one side and a carbon impregnated blade on the other. you could cut through iron bars with the carbon blade.
I built me a floaty out of an old plastic milk crate and a truck tire inner tube. I added a small deck with a pocket for my gps and a small mast for my dive flag. it sure beats trying to carry some of the heavier items back to shore or the boat, plus it is nice to have a gps to mark a spot so you can return. this is great if you hit a hot spot just as your tank is going empty. I have also taken my digging tool and anchored the float to a hot spot while I switched tanks to return.
next thing I never go without is digging gloves, I like the knit ones with the small plastic dots. the canvas style fill with sand and prevent movement. I do hjeartily suggest you get a tetnus shot and hepatitus shots too, you never know what you will be gigging and getting a poke from some junkies syringe is a job hazzard that could happen, not to mention broken glass or fishing lures/hooks.
I wish you the best of luck and I hope you will show us your many finds on treasurenet.com I truly enjoy this site and all the wonderfull people and their fantastic finds.