All the languages are equally important and has it's own place.
What language can you choose? - That depends on your interest and skills. According to me, any programmer would start off with the basics of #C. Its the fundamental language. And then progress towards Java and PHP.
Once you learn #C, other languages will be easy to learn. (Java, PHP).
I'd recommend you to learn #C as much as you can, and then learn HTML. The progress should be like this:
#C > Java > HTML > PHP > CSS and blah blah.
There isn't any rule that you should study them in an order, but #C is the basic language and it'll help you learn other languages easily.