Microphone - just try using whatever you have around. I have a range of mics due to doing Amateur Radio, PA for local events, etc. The current model of the mic I have settled on for my VA use in E D is https://www.amazon.co.uk/Behringer-XM8500-Ultravoice-Cardioid-Microphone/dp/B0002KZAKS/ but I have mixer desks and USB interfaces for other stuff I do so that mic might not suit your setup.
If you decide to use headphones then just about anything would work - I have Bose noise-cancelling ones I use late at night with the DTS-X enabled in Elite (turning off the speaker system to prevent disturbing neighbours) and keep using the same mic. I also have HyperX Cloud II which I use for flight sims (voice chat there comes via comms channel so can be separate from main audio) - it is very comfortable and has a really good boom mic. https://www.amazon.co.uk/gp/product/B00SAYCXWG/
EDIT - Note that you don't need to spend the sort of money the above stuff costs - I just have them anyway for other reasons. You can happily run VA with HCS using much lower cost stuff.
Thanks very much for the suggestions!
With the Cardioid mic, do you have it mounted somehow?
The HyperX headphones with mic are very appealing to me as well, as I could use those for other purposes. (I could even use them for work conference calls and suchlike).
So I’m not sure which way I’ll be going at the moment... decisions! I do have an HCS voice pack in mind for a first purchase though.. Vasco. Having Brian Blessed bellowing at me whilst flying about sounds like fun