Take you time and plan!.. future proof it..
If you take a panel off or out.. ask yourself if there might be a cable or wire that might be useful there..
Camping.. got to meets and shows.. look and see how various member run theirs.. get first hand reviews.. ask questions. Don't just buy the 'norm'.
Try not to waste money on things you know you'll want to change in the future..
Be in for the long game.. it will pay off better.

P.s welcome