I just finished wiring my '51 with an EZ wiring harness. There are a few things to think about when you do your lights.
Steering column - If you are using a newer GM or Ididit column it's easy to do. The EZ kit includes a flat plug that will attach to the columns stock wiring. I don't know what's involved with a different style column.
Dimmer Switch - Usually a floor mount switch like this to control your brights. This wil also plug right in to the EZ harness.
https://www.speedwaymotors.com/Speed...itch,2370.html
Headlights/ Relay - I highly recommend the Cibie headlights and using a relay.
https://www.amazon.com/Cibie-082440-.../dp/B008DQV88Q
I used a relay kind of like this, don't remember the exact one:
https://www.amazon.com/2-Headlight-H...70_&dpSrc=srch
Front park lights/ turn signals - If get LED,you will need no load flashers. Or stock style like these:
https://www.classicparts.com/1947-53...ctinfo/47-012/
Headlight switch - It looks like you have this figured out. I just used a stock '68 Chevy truck switch.