So I have made my first text based game and I am now ready to move on to using an interface, but I have no clue where to start. If anyone knows where I can learn online, preferably free, that would be really helpful. Thanks guys!
There is a multitude of different GUI libs. I like GTK+(using gtkmm C++ bindings). Other popular ones are Qt and wxWidgets.
Find one you like, download it and read the documentation to get it working for your environment. The popular libs have tutorials right on their websites, so start there. Once you get the hang of it all you need is the documentation to use as a reference.