Do you have any experience with the R language? If you are trying to use R for the first time, a good learning approach is to workth rough the swirl package. http://swirlstats.com/
If you wish to nicely present a graphical user interface for your user to interact with I would recommend learning the shiny framework.https://shiny.rstudio.com/
I wouldn't recommend learning shiny before learning basic R first however. Good luck on your journey.