Hi Jon, Sounds like you know your way around the shop! My advice would be one of the knife supply houses. Texas Knifemakers Supply or Sheffield knife supply for your first knife. Order a kit (my first was from Texas Knife Supply called the "judge's favorite"). This will let you learn as you go, as you will have the blade ground out and you can focus on the guard and handle which can be trickier than the blade sometimes. If this does not interest you and you want to jump in the deep end, I will send you a piece of 1084 and let you profile it and then I would heat treat it for you, if you would like. Your decision, let me know and I would be glad to help you and your son. My 7 year old daughter and I just finished her knife 2 weeks ago and I think it was the most fun I had making a knife in a long time. She thinks my forge room is where "magic" happens. The red box elder wood that turned out pink was the best part in her eyes. Good times, let me know what you want to do.
Brad