The programming language you learned at school is worthless, and not just for Linux, either. Soon enough, there will be a new microsoft language, or at least a new version, and everything you now know will be deprecated. All languages are like this, more or less.
What makes you a good programmer is your ability to understand computers and break problems down into well-designed systems; knowing a programming language is nigh-worthless, because all you need for any arbitrary language is a week and a manual.
Just pick something. It doesn't matter which language. Or which IDE. Hell, you could start with bash shell scripting, it's all the same. Fiddle around with it, and once you got a feel for it, dive right the hell in.