final set up

just finished my first 12 foot aluminum sea king project fixing from leaks and getting ready for a new steps to get it ready for final set ups from your advises i will buy x-4 fish finder . I have small trolling motor so the questions are:
what kind of battery and what brand i should buy to handle
a) trolling motor ( have one)
b) fish finder ( best place to buy?)
c) front rear lights ( the best places to shop for it and lowest prices )
Also need-
d) set of oars ( where to buy?)
e) swivel seats ( where to buy cheapest ones )

And i am not sure if one battery good enough to handle trolling motor fish finder and night lights
Planing to place battery in a front of the boat i am not good with wires but if some one give me an idea how to set up all connections from one battery
and show may be plan or pic how it works would love to do it by myself Thank you very mach for reading.

I would use 2 batteries, 1 specifically for the trolling motor, and the other for the electronics. Use a good group 27 deep cycle for the trolling motor, and a good group 27, probably a deep cycle for the electronics, also invest in a good charger and keep the batteries fully charged. You can find a good inexpensive depth finder and seats, lights etc, at any walmart, gander mtn, or dicks, you don't need the latest and greatest to start with and catch fish, just my opinion, good luck with your purchases and keep us informed, oh almost forgot, I use Exide batteries.