Your on the right track finally!
First you need to love the breasts you have, because these are what you will nurture to become the breasts of your desire.
And to begin this new admiration, I would suggest massage. Its easy, free, and the best way I know to feel your growth and form them correctly.
I have two of my favorite threads that will pretty much tell you everything there is know about the fine art of breast massage:
So take some measurements, and pictures so you have a reference. Then begin.
Also a big one here is to talk to the partner, and get him on board. Its ok to tell him your sensitive about the size of your breasts and want to begin NBE. Even invite him to help with the massage. He'll enjoy that and make sure you tell him if he is doing well or needs to change the rhythm. Be positive so you both will be working to the same goal.
I'll let the other girls here guide you on the best herbs to use.