Have you started looking at potential properties/areas yet? Must be very exciting having something like that to look forward to. I'm way over the south-east side (Caerphilly), but used to work down that way a lot. If you're looking for a helpful book, I wrote one about two years ago - The Practical Guide to Buying and Running a Smallholding in Wales. Gives a lot of info on moving to Wales, getting used to the culture and language, etc, as well as listing most of the leading estate agents which specialise in smallholdings.
Good luck with your search.
Liz