You are now a commercial pilot and do not and should not have to be spoon fed at this level! Yes, you will need a "Super CFI" to give you some training and an endorsement. I apologize for getting philosophical but earning the CFI is the beginning and not the end. In other words, you will learn more by teaching than by being taught! I would choose the lower cost pathway but develop the professionalism and discipline to be an excellent instructor! Good luck and definitely go for it!