When to Start
Starting to Bush
Keep the Center Clear
Looking for the Collar
Cuttings Need Wood
If you are trying to plant cuttings you need to make sure those cuttings have wood on them. When they start getting bark the cambium layer is present and that cambium layer is what stores the ability to make a new root. The cambium looks like a diamond pattern.
Using Green Cuttings
I heard, contrary to popular belief that cinnamon (which people say can help with rooting) may not even have the rootingI think it's more so that cinnamon is more so anti-fungal which then prevents fungus from killing off the bottom. It's not that the cinnamon is actually helping to form the root, cinnamon is just helping to prevent fungus from forming which then would prevent the root from growing.
You can begin the shaping process of your tree when it starts to get wood on it. You can start from where your tree has first branched or at the main trunk. Leave around 18" and make a cut. Your tree will sprout a few times from that 18" piece. When those new sprouts get 18" long, cut them and they in turn will pop out a few more sprouts. Keep doing this until your tree is nice and bushy, but make sure to keep the center clear to make harvesting your tree much easier.
Peace, Love, and Prosperous Growing!