I would like to learn plant anatomy, I am searching for techniques which will allow me to realize successful and clear microtome slide and how we can preserve them longer.
So -only partially answering your question: have you ever tried to read some "Handbook" or special literature on Plant Anatomy or do you attend courses at your University: I really do hope your PI's / Assistant Professors etc. have some clue about your task of university studies....
Please read Plant anatomy by katherine Esau. Many books on techniques of plant anatomy exist. Search in the market of Springer- Verlag or Oxford Univerisity.