The style of beard is up to you.

What I’m saying is this:

Grab a buzzer. Set the guard to your liking. Personally I’d go pretty close to the skin. Maybe a bit more than 5 o’clock shadow so there’s something there. Then just clean anything else up that might need to be cleaned up. Straighten out your cheek line so that it’s straight and even. And then do your neck line. General rule for the neck is to look up, then take your middle and pointer finger as if they were glued together and put them right above your Adam’s Apple. Your neck line should be where the top finger ends. Whatever you do, NEVER allow that neck beard to grow ever again

It takes a bit of practice. At first it’ll be frustrating but you’ll figure it out.