I think you should focus on programming itself and learn how the compiler works also master one of version control systems. Once you understand the idea behind the programming languages, it's easy to understand different languages. As people said, 10 years from now, your best language may be out of date but the basics will be same.
you can just install Koding chrome app and you got free virtual machine, text editor and all other you need to develop.
also there are 2 koding chrome apps,
Terminal app : http://bit.ly/GQtPh1 and koding app http://bit.ly/17sCYmv, you can also visit https://www.koding.com if you dont want to download anything.