Kaylee
Don't know how you've booked your car, but in the past we've used Virgin (yes, I now know it can be done cheaper), but when you get your docs they give wonderful foolproof istructions of route from airport to heotl, including tolls & their costs. We have a little pop up map you can get for a few pounds in places like WH Smith & as long as you are not going off the beaten track, this coupled with the freebie ones has been perfectly adequate