Yes it’s safe to use a DA on new paint (plenty have their cars pro detailed and machine polished straight off) but if you are a complete novice I’d definitely notch up some practice on a ‘lesser’ car first. And go in with the least aggressive pads and polish first.
As for products to seal, it a very open expansive question. Some prefer waxes, some favour nano or polymer sealants such as Gyeon, Gtechniq, Sonax. Some guidance in this thread and lots and lots of threads with good advice in the detailing section of the forum, so start by looking in there, and maybe post detailing questions in that section if you have more questions.
http://www.golfgtiforum.co.uk/index.php?topic=277318.0
And, as said, forget the wheel insurance. Often it doesn’t cover diamond cut wheels. Look at ASA for GAP, discount codes PISTON15, Money10 and VP10 have worked in the past.
Thanks Booth I was wondering how long you would take to reply, top notch detailer yourself, I see you on vwroc as well as I was considering an R.
I think I've got a good deal on GAP, probably won't go with wheel ins, looked at policy wording does cover diamond cut but only up to £150 to repair or replace per claim, i think a Brescia would cost a lot more than that!
Will look on detailing section and ask questions there.
Just trying to use my time up wisely while waiting for delivery.