The big thing to remember is endmills are consumables — usually you’d want 3 of a given endmill you’re using a lot, one for roughing, one for finishing, one as a spare. See: https://docs.carbide3d.com/support/#tooling-support
If one is starting with just a 1/4" collet:
- three 2-flute 1/4" straight endmills (such as the #201 endmills from Carbide 3D — one will be included with the machine, a pack of two will fill one out with: 1 for initial experimentation/roughing, 1 for finishing passes, and 1 spare
- two 2-flute 1/4" ball end endmills (such as the #202 endmills from Carbide 3D) — if one wishes to do 3D modeling or cut parts which have rounded profiles along the bottom (often a good idea in woodworking for increased strength)
- two 90 degree V-bits such as the #301 from Carbide 3D — if one wishes to do V-carving or cut joints which use this angle
If getting a 1/8" collet for detailed work:
- five 2-flute 1/8" straight endmills (such as the #102 endmills from Carbide 3D [9]
- two 2-flute 1/8" ball end endmills (such as the #101 .125" Ball Cutters from Carbide 3D)
- two smaller straight endmills (say 2 mm or so) (such as the #112 0.0625" endmills from Carbide 3D)