Kayak customization is a personal thing, i.e., making it how you
like it. So everyone suggesting you spend time fishing out of it
first is spot on. Then you will have a better idea of where you like
things.
Things such as - "hey, I would rather put my rod in a holder here,
as opposed to there, where company X installed it".... YouTube is
a great place, as are just googling and looking at kayak mod images.
And welcome aboard, @hisjr!