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MilKit valves sound good
https://thecycleclinic.co.uk/collections/tubeless-bits-and-bobs/products/milkit-tubeless-valves
Obviously a little expensive but being able to replace sealant easily is a bonus
I bought some the other week - to go tubeless on a second bike - but haven't fitted them yet
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Whatever's cheapest and works. Have these on my mtb. Come with a spare valve core and a tool to boot.
http://www.wiggle.co.uk/joes-no-flats-tubeless-presta-valve-kit
DIY, buy 50m of rim tapes in a couple of widths, 1 litre of sealant and something to inject into the valves (I use the syringe from the vets for administering dog medicine) buy decent valves and some Schwalbe easy slip.