Any advice on what I need to know about country living/owning property?

OP, check with the well records on the well flow. 5 GPM is very adequate for household use. But if you want to water things a lot, you'll have to be careful at that flow rate. 1GPM is low and you have to conserve for household use, and forget about watering anything.

Taste the water to see if you like it. Can be excelletn, can be pretty rough, If poor tasting but you like the house, then first check with a water treatment palce and maybe have them examine it to see what may be done to treat it.

Septic is probably OK, but see in the county records for what number of bedrooms the septic is designed. Sometiesm folks will pay for a 3 BR septic and then add bedrooms. Not a disaster but you don't want to be selling the house later as a 4 BR and find it has a 3 BR septic. Pump the tank to examine as part of the pre-buying inspection.

Quiz your new bride on what sha wants.....Good luck and I hope you find what you want. That linked property looks pretty nice. Can't add to what others have already said.