Hardest part is getting through the itchy stage. It will drive you nuts, but persevere. Let it grow out a bit and start trimming it back and lining up the edges. Also keep your neck shaved, so you don't get end up with a neckbeard. At least on my beard, the part of my neck where hair grows, it grows in spirals and looks funky.
Looks like you're off to a good start. Just keep letting it grow and it will fill in. Also, use conditioner when you shampoo it. Shampoo will dry it out a bit and make it itch more.