That's going to be a very heavy walking stick.
I like them when they are light and small enough in diameter to be able to completely close my fingers around, 1 - 1 1/2" max, but still be strong. Think about how many times you are going to have to pick that up and place it forward at about 3/4ths of your arm reach. My last hiking sticks were Bamboo and about 1" diameter. About the lightest walking stick that can be found.
When hiking, and in need of a replacement walking stick, I would look for long and straight saplings a little larger that I needed, use them for the duration of the hike, then remove the bark and let them thoroughly dry before personalizing them. My favorite was Beech because of it's hardness. I didn't have a lathe, but a spoke shave got it about right, and then heavy sanding from there to make it round. The handle portion was left a little larger, and frequently carved. I never spent money for the materials. Potential walking stick candidates are everywhere in the woods.
Charley