Its not so much the language you choose but the principles of programming and algorithm design that you will want to learn.
I suppose there are pro's and con's to each language and it's personal taste that sways one to stick with a few select languages. C is a good one to start with if you have an Arduino handy. Keep things simple and interesting so you want to learn more and more otherwise its easy to get frustrated.
Check out this > http://www.businessinsider.com.au/best-tech-skills-resume-ranked-salary-2014-11 - good indication of what the industry is seeking.
Perhaps try out a few (as well as their associative IDE's), go through a few books or youtube tutorials and you'll soon see which languages you like and dont like.