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Hi jet,
got to love a big size dob, i've got a 12" goto skywatcher which is a flex tube.
the first accessory i would buy is 'Bob's knobs' for the secondary mirror. they make it possible to collimate the secondary by hand and without the need for metallic tools which are fiddly and can be dropped onto the primary mirror!
Also you will need some kind of collimating tools to align the mirrors up before use. there are expensive and inexpensive options for this.
other possible items i would consider are a coma corrector, however that is a personal choice i never got one till i started taking photos.
there are many other accessories you can build up (eye pieces, barlow lenses etc) but from my view, the bobs knobs and collimation tools are the top 2 you would need early on.
also keep in mind a 12" dob is quite a BIG and heavy thing to lug around, if you haven't seen on in person it might be worth looking at one first you may decide the 10" is a better option, particularly if it is solid tube.
Cheers,
Rusty
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