wiring starter button

My Easiest suggestion is to wire the + Batt wire thru a dissconnect switch Directly to the starter. From that point, Run another say 6-8GA wire to a Fuse box, My fuse box and Starter Switch came from a boat. Also, wire your alternator output to the battery side of the disconnect switch. The starter solonoid will take about a 15 amp circuit and a decent HD momentary (spring loaded) Switch