Always glad to chat up our machines.
We did just have a thread on this:
TLDR version:
Size — get a 2x2 if your projects fit that, 4x2 for boards, 4x4 for sheet goods
Accessories — BitSetter is standard, BitZero is for setting origin relative to rectangular stock or a flat surface or holes in a conductive material (folks who use rough-cut lumber often don’t use it), Sweepy Pro is nice for flatter projects where it can be adjusted to match the stock/part, air blast is good if cutting metal if one is willing to set up a compressor
Spindle — a BitRunner will afford auto on/off w/ a trim router, VFD spindles add speed control and come in two diameters, 65mm which has an ER-16 collet, 80mm which has an ER-20 which allows 1/2" shank tooling but requires a chiller (included) for water cooling
Vacuum — current darling is the DeWalt Stealthsonic, adding a cyclone such as: Mullet Cyclone Dust Collector - Carbide 3D will save a lot on filters/bags, for auto on/off see: Controlling a Vacuum with your Shapeoko
Software — Carbide Create is bundled with the machines and a good starting point, and the principles from it will apply to other software, folks doing 3D mechanical CAD often get: Alibre Workshop CAD/CAM - Carbide 3D
Tooling — the starter kits are usually a good fit
Tools — a set of T-handle metric hex keys is a nicety for assembling, a ratchet even more so, calipers, a square, and a centering rule are often useful, a hand saw to break down stock may be helpful
If you’d let us know what sort of work you wish to do and how you wish to approach it we might be better able to advise.