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Just my two cents but there is no right answer. I recommend that you start collecting recipes and trying them out and when you get into a groove of what you really like to do with your BGE you will begin to determine there are things that you would benefit from owning. There are a few basics most have already covered like::
1) platesetter (indirect cooking is done by 98% of eggers and this works well)
2) thermometer (Start cheap you can always upgrade)
3) grid extender (a extra 2" ceramic fire ring works well but you can go about as far as money can take you on grid accessories when you can get by with some fire bricks under your grid also)
4) basic grilling tools ( obvious )
5) some king of firestarters and something to light them with (I won't start that debate)
6) Eventually a lot of cookware unless you are just going to do basic smoking and grilling. Which can come a piece at a time (but over time can become a huge list of things you own) like cassoulets, Dutch Ovens, Roasters, Pizza Stones, bean pots, skillets, griddles, woks, tarte tatins, tagines, the list is endless.
I like having a table. The nest does its job but this little shelves wouldn't do.
1. Ceramic Grillworks Swing Grate (this gets you cast iron and raised cooking surface in one)2. Plate Setter or indirect setup3. Not necessary, but nice to have - BBQ Guru temp controller4. Pizza Stone5. V-Rack5a. Group buy on lump charcoal
@ChokeOnSmoke What are you pizza troubles? It took me like 5 tries but got it mastered now. I now hate very out. Let me know what you're struggling with and I'll help you out. I've found that the dough us the #1 factor in my success.