You did ok by removing the index.html file from your Public directory. Thats the first step in creating your own web app after installing Rails. You now need to go and create or generate a page and then configure your routes.rb to your new page.
Next step: Command Line$> rails generate controller newpage (hit return or enter)
This will create a controller for the new page. Open your text editor and create a page called newpage.html.erb in the newpage directory. Put whatever html in there you want, for example "<H1>Hello World!</H1> save the file.
The open up the newpage controller file inside the controllers directory and before the end statement add a few lines. Then on one of those lines type:
And then save that file. Now go to your routes.rb file and open it in your text editor. Just about everything inside there should be commented out. Scroll down to the root example.
#root :to => 'welcome#index'
You are looking for the line above. You can either copy and paste it above without the #(comment) or just uncomment it. But be sure to read the text on that page at some point to familiarize yourself with the routes file.
Then change it to:
root :to => 'newpage#newpage'
And save it. Then check your browser again going to the localhost:3000 url and it should pull up the "Hello World!" page you created in the newpage directory. If not then just follow the error and fix the problems by googling them.