You'll need to get an accountant to set up the company, probably best to start by visiting a solicitor to run through your plans. There are regular official costs and quite importantly, these continue even if your initial reason for having a limited company ceases (e.g. you sell the property). There are plenty of people who's limited company bit the dust as far as trading goes a long time ago; they still have costs relating to owning a limited company.
It's a big thing to take on, something you need to think through carefully.