As I am understanding from your question you want to write literature review for your thesis? If it is so. It totally depends on the topic of your thesis.
Anyone can help you only if he/she know about your topic.
Basically , you can start with the conventional drug delivery, its drawbacks, advantages of NP based drug delivery, Different types of NPs, Application of NPs in disease (specific to your research).
There are lot of reviews already have been published on this topic you can search on PubMed, Scholar, Researchgate etc.
I agreed with Mohd Mughees, You also can add on the mechanism of action for particular targeted disease and talk about nano-safety for future use in clinical settings. Best of luck!