Dan's answer is spot on, but maybe once you've got a few builds under your belt try a taper. My 4 string necks taper from 42mm at the widest part to 30mm at the nut. 8mm string spacing at the nut and 12mm at the bridge.
A standard 1x2 from the home improvement store will be just fine for a 4 stringer. I use 5mm spacing for the outer strings to the edge of the neck, and 9mm spacing for the interior strings.
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Dan's answer is spot on, but maybe once you've got a few builds under your belt try a taper. My 4 string necks taper from 42mm at the widest part to 30mm at the nut. 8mm string spacing at the nut and 12mm at the bridge.
A standard 1x2 from the home improvement store will be just fine for a 4 stringer. I use 5mm spacing for the outer strings to the edge of the neck, and 9mm spacing for the interior strings.