For purring on a mouth call a split V is the best, but any mouth call with a cut will work.
Having a number of different calls like a pot call and a box call is also a good idea as sometimes it takes a different tone to get that bird your after. Learning tools concist of more on hands training or a good Learning DVD like the one that I marketed a couple years back "Learning the Ropes of Wild Turkey Hunting" this dvd shows you the in woods experence that one needs to be successful. Purners , Binoculers, a small pocket saw, condisioning stone for pot calls and even a number of different wood strikers are important to change the tone of your pot calls. Carbon striker is a water proof item for your pot calls too. Box calls I like a Boat Paddle for volume as every now and then you need to strike up birds way off the area your hunting and you can call them to you with volume type calls. Tube calls are another call that can reach out and all the type of turkey languge can be done on them too. Sitting is a large issue and the seat is very important. Afternoon hunters that want to be successful need to sit and wait out moving and feeding birds. As said a small intertube is a great seat as I've used one for about 10 years or maybe more and when your back side feels good you will sit longer. A turkey gun is very important and with the presure of turkey hunters in your area it won't be long til the birds hang out away from setups and wait for the hens to come to them. One of the best chokes I've used is the " Pure Gold" from the USA and it has turned my turkey hunting 20 gauge into a true 45 -50 yard turkey killer with a load of Hevi shot. Yes Hevi shot is exspenceive but for a hunter to use only 2 shells a year , its not hardly worth waisting a shot at a large gobblers at that max range now is it ? To many new turkey hunters chance shoot at gobblers that their guns can not just make that max range and then you have a wounded gobbler or one that will not come back into you in that season, so you'll have to count on other properties to use a tag.
Optic's and sights are another option, and a turkey hunter can makes things a lot easyier to aim on a bird by just lining up crosshairs or fiber optics on the head to take down your prize.
One of the most important things I have learned is to understand what the calls mean and what your saying to a bird in the field. When you talk right it makes the game easyier....