It's not 'rocket science', but there is a learning curve. Easiest, I think, is if you can build a duplicate of a wheel you already have. Besides the rim, hub, and spokes, you'll need a proper size spoke wrench, a dishing gizmo (helps in centering the rim between the lock nuts), and a truing stand. If you get the accoutrements I'll attempt to talk you thru the process, and I know there are others here with more experience who'd be willing to help you, too.
Thank you for that, you have no idea the warmth that gave a new member and maybe one day, you will get the PM seeking advice.