Buying a business to live in

Hi im looking for some advice on buying a property? its currently a small newsagents with a two bed apartment over head, which needs a bit of work, Its on a residential street. Im thinking of purchasing and living upstairs with my wife and daughter and continue renting to the guy who runs the shop for one year i have spoke to him about this, then converting the shop into the rest of the building after the year is up.
As this is something i have never done before,can anyone offer me advice as to what i may be looking at when it comes to planning permission and Insurance i may need to get. Cheers