Hi Peter and welcome,driving in Europe for first time can be daunting but research and preparation can help to make it easier and pleasant.Check on AA or RAC websites to see what you are required to carry as to vehicle paperwork and equipment,I would recommend you plan your overnight stops,depending on how far you want to drive in a day and possibly book sites in advance for your journey south,if overnighting in motorway service areas,I always park in light areas not tucked away in the corner,for security reasons,but motorhome parking Aires in towns or villages are generally more pleasant and safer as are campsites.Many motorways in France,Spain and Portugal are tolled but standard of National roads is good ,and free ,and the scenery is much better.All the areas you intend to visit are far more motorhome friendly than uk,with many designated parking spots and service points for water and waste disposal,after the first few days you'll get into the swing of things and have an enjoyable new adventure,regards Paul