Welcome,
All the items you want to try are great, but they might not be the best choice for a newbie. It has been suggested that you start out slowly and add as your hair improves. That is the best choice.
I make my own potion and love it, but I started using castor oil, and knew my hair loved castor oil. All growth stimulating products work well on healthy hair. Many increase shedding and can be drying, these two items are detrimental on hair that is already dry. Once you know your hair and it's growth rate, it can be fun to add growth aids.
Black Tea rinses strengthens the hair, and reduce hair shedding just like protein can, and both of these can be drying too. I wouldn't combine this with potion or MTG because it would be too drying for most naturals.
Great to hear your hair loves the baggy method. Enjoy your hair journey, it can be so rewarding.