Apprentice camper.

Hi all. I am contemplating a European road trip next year possibly 4-6 weeks for my birthday, its a big one lol. I am a complete novice to this, although I have driven to the south of France and Spain for over twenty years now in cars and would value your advice and recommendations please. Looking at an Alphard / Vellfire and would love to know the following. What manufacturer options are the most useful, unnecessary? What accessories are the most useful Type of awning. I am thinking a drive away is probably best for me so as can set up and then sightsee. I think that the slimline side pod with the cooker etc behind the drivers seat so that the bed is as big as possible for a good nights sleep, there are two of us. Is an inside cooker facility useful or is it better set up outside. Would it be better to get already converted or buy one with a view to convert to my specifications. Is the Toyota big enough for this duration. Any other thoughts, recommendations and things to avoid would be greatly appreciated