Oil heating is fine, it works pretty much the same as a gas central heating system, except you have a much bigger boiler, probably on an outside wall, and will have similar controls and radiators, depending on how modern the system is.
You may find that there is an Oil Club in the area (check online). The idea being to encourage more people to order at the same time in order to get the best prices and to minimise the number of big tankers coming through the villages.
With a rented property, agree how much oil you will start and finish the tenancy with so you don't end up too much out of pocket. Oil prices vary weekly, in the same way as petrol prices vary, and are cheaper in Summer. Often there is a minimum order, e.g. 500 litres. Make sure that the oil tank is screened and locked as oil theft is rife in parts of the countryside.
Aside from other advice, check broadband speed and mobile phone signal for your provider. You'll get more frosts and so much more mud than in a town.
If there are no street lights, you'll need a good torch.