I almost hate to say this, but it really almost doesn't make a difference... at least not right now. You don't know enough for it to matter, yet. Pick any one of the more popular languages that has a good community, plenty of documentation, and good libraries, and just run with it. Build some stuff, learn about programming in general, and then you'll have a basis to start comparing your chosen language to the alternatives.
Don't take this generalization too far though. COBOL on COGS[1] aside, I really don't recommend you pick COBOL, PL/I, FORTRAN, RPG/400, APL, Ada, etc. as your first language, especially if the goal is to build web applications.
But something like Groovy, Ruby, Python, or even Java or Perl, is a fine way to get started.
[1]: http://www.coboloncogs.org/INDEX.HTM