Hello expolife,
Thanks for sharing! That's great that you have grown and harvested your own bark.
There are many teks that explain the process on how to best extract your spice. Also, the really good part of the plant to use, is the pink/purple inner root bark. It has 1.5 - 2% active ingredient, I believe, however I have read reports of people combining the outer root bark as well (doesn't have the same percentage of DMT though)
Take a look at the extraction methods here on the nexus, and find one that best suits you! I personally recommend Cyb's Salt Tek but Noman's STB is apparently a good one to use as well.
Take care!