Just keep in mind that buying with Exposition Points (EP) happens before buying in-game post launch via the Land Management Table (LMT), so if you really want a specific spot, EP is the more reliable way to go.
Counts get to regulate which parcels can be purchased in-game, so that may affect your ability to get what you want. You also have to travel to the county seat to interact with the LMT and acquire land that way.
EP on the other hand will cost money and require you to have at least a bloodline package. Otherwise, you can't participate in Expo.
With respect to NPC mayors, it could be beneficial if your intention is to move up in the social hierarchy of a settlement but it can also be bad because you can't really collaborate with an NPC, certainly not to the degree you can with other players, so this can affect your ability to pursue and achieve your goals.
Anyway, congrats on getting a piece of the Elyrian pie, and welcome to CoE!