Ignore your brother. Get Nigel Calder's Boatowner's Mechanical and Electrical Manual and read the electrical section.
You will want to get the following:
A battery or two, depending if you want a house bank or not—I'd recommend having one for the lights/bilge pump and one for the motor.
A main battery switch—I'd suggest a BlueSea Dual Circuit Plus type switch so that you can turn on the electric trolling motor and the house bank for the lights at the same time.
Nav lights—preferably LED to keep the electrical draw down.
A six-switch Blue Sea WeatherDeck fused switch panel
Two primary fuse holders, one for each battery.
Marine grade wiring—I'd recommend ordering from Genuinedealz.com as they will crimp the battery terminals onto the wiring for you.
I would also recommend you read Maine Sail's post on terminating marine wiring. Located here.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.