Android app modification

I currently have an app on the marketplace itajweed [login to view URL] It uses images as a book. I want to use text as pages, the language is in Arabic. A future version needs to allow the the selection of each sentence to play audio (not needed now). YOU WILL NEED TO SUGGEST WHAT FORMAT TO DELIVER THE TEXT PAGES IN I.E. HTML, MS WORD,ETC. It has the following features already which will stay: * potrait and landscape viewing. * zoom and pan * flip book left to right * bookmarking sections * search by chapter * search by subject (this may have to be a text based word by word search possibly) * Add favourites * find favourites * basic faq and about pages. * Basic share feature