A great cheat sheet/decision tree from the Institute for Digital Research and Education at UCLA that links to short tutorials in different stats packages.
There are four tutorials here that will allow you to analyze text.
What is R?
“R” is an open-source programming language used to make statistical analyses and graphical interpretations of data. RStudio is the application you use to work in R.
RStudio is a set of integrated tools designed to help you be more productive with R. It includes a console, syntax-highlighting editor that supports direct code execution, and a variety of robust tools for plotting, viewing history, debugging and managing your workspace.
This document gives a big starting point for people newly interested in R. It emphasizes how R works, with the aim of a beginner, rather than expert, use.