Hi Mattio!
I live in NYC so I have no words of wisdom for you about pursuing you goal. I would like to add though that if you live in an area with deer you will have to fence the field. Deer LOVE daylily blooms! Even if you have daylilies planted around your house that the deer leave alone I wouldn't count on them being too timid to ravage a field full of daylilies. Also watch for burrowing critters, but a dog or cat roaming around would most likely deter them.
I do hope you achieve your goal! There can never be too many daylily farms as far as I'm concerned! And definitely get into hybridizing your own. I'm hybridizing in my tiny garden and getting some great plants. And registering new daylilies is pretty cheap. Definitely a way to get your new farm on the map! Good luck!