What is the best way to transplant this clone to fit my garden and achieve maximum yield?

kinda depends on region and how much vege growth you are going to get - all about size of the plant at the end as far as what you "need." i know at smaller sizes "they" say 1 gallon per 1-foot of vertical growth, but not sure how well that translates to larger plants outdoors. If it's growing taller than 4-5 feet, i'd go with a 20-gallon. you can assess rootball and how much it filled it out when you harvest and determine if you can go down a size or not based on comfort of the roots in the pot. (ie not rootbound) outside you should be thinking kg not g. 😁 muahahaha!