im planning to marry next year spring/summer?

im just renting now,but i need something more suitable for us to live together when she gets here,i will be renting!
if i move soon how long do you need to be in that place to show your rent payments to get bills,council tax and all other stuff in my name at that address how long do i need to show i have been there for?

will this affect my visa?

and also once she as been here for 2 years and she gets full residency,can she come and go as much as she wants to or is there another time limit?