How to load text with formulas and images in sqlite database and retrieve for offline Android application?

I am new to coding world. I am trying to develop android app which will be study type offline flash card app(with lot of theory,formulas and images) with question and explanation(about >1000 flash cards). I googled a lot and found that storing data in SQLite is best option. I would like to preload all my questions and explanations in SQLite in seperate columns and retrieve the same separately to android flash card. Now my problem is:- 1. How to load text with formulas and images in sqlite database ?. I am using Firefox plugin SQLite manager. 2. How to display retrieved data in order.i.e. questions & explanation may contain 2 or 3 paragraphs with equations. 3. I am also concerned about the security of the data as i want to include in-app purchase option . I understood from various explanations that data from asset folder is first should be saved in data folder before opening.

There are already some apps like pocket physics,pocket aptitude which can display image,text and equations, but i am unnable to find right source of info. Please help me by providing some information or source from where i can get some clarity.