You'll definitely need a trailer, that is for sure! That is one big, solid vessel!
But, the PA 14 comes so loaded down with standard goodies that other than looking for those specifics you mention, I'd be slow to outfit it.
A lot of us with other makes and models need to add rod holders; you won't need to, at least not at first, because you have all of that horizontal rod storage. You won't need a trolling motor; you have a propulsion system that could likely keep up with a trolling motor. The stock seat is great so that should be okay.
Anyway, you get the idea, be a bit slow to outfit it until you watch countless videos of how others are doing it, see them out on the water, then decide what you really want before you start drilling holes and so forth. Early purchases are often impulsive. And, accessories are expensive.
Not sure whether the PA 14 comes with a paddle as standard or not, but I like the double bladed models to move a big vessel like that around without swinging a single back and forth from side to side.
I bet you love the PA 14.