I’m big on getting everything set up first, then expanding + upgrading later. This is what I’d go for:
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Selection of endmills: #201, #102, #302, #202 - you can start with cheap ones, but the Carbide3d ones are good quality and priced well
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Dust deputy cyclone separator - see here, this will take 95% of the dust particles out before they hit your vacuum - after 2 years i’m still on my first Vac bag
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Shopvac or similar. I use a festool CT midi and though a little pricey it’s got a HEPA filter, very quiet and powerful.
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Threaded inserts so you can make Ben Myers Wasteboard and Fence + Clamps
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Sturdy bench for your router, See this forum post if noise will be an issue for family/neighbours, go for an enclosure
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I’d just get the Carbide3d router or makita if it were me. cheap and reliable. I bought two makitas and use one as a handheld router, nice and light and powerful enough for most stuff that comes off the machine.
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Ensure you have some way to cut stock up to make things on the machine. Whether it’s a circular saw, tracksaw or table saw. Make it easy on yourself. This depends a lot on what you’ve already got - sounds like you already have some woodworking tools
My parting words: be prepared to get frustrated while getting your head around the CNC process. it takes some time to get it worked out, but once you start to understand it all and get your process sorted it is insanely rewarding! Also ask here for help, the community is great here