Till you know want you want to make.
3" vice -bog standard machine vice not a wobbly tilting one. Make it's locating blocks for your first project
Cutter holder – Vertex Osborn clone suits me as you don't have to wang it up very tight and I have a load of threaded cutters, others like ER versions for plain cutters.
tee nuts can be 60p each at Warco – pairs of clamps are best from RDG – buy extras at an ME show. Get some decent threaded rod in whatever size fits your table slots.
Parallels – small thin ones, lathe tool blanks will do for thick ones.
That covers the two primary objectives.
- holding the work still
- holding the cutter
The rest is nice to have which you may never use..