Before working on report rendering, let me give you some hints to expand your knowledge of Shiny, which is an always expanding universe, adding features day by day and also giving a hedge to R compared to other data mining languages. If you are interested in building more confidence with this powerful tool, you should definitely look at the following:

• Shiny widgets, that is, a collection of available input controls. See them at: https://shiny.rstudio.com/gallery/widget-gallery.html.
• Deepen your knowledge of the reactivity framework to learn how to make your user interact with the data provided: https://shiny.rstudio.com/articles/#reactivity.
• The Shiny dashboard is a further expansion of the shiny framework, also available to work on real-time data: https://rstudio.github.io/shinydashboard/.