flycheck on Emacs24

[haines]

I'm running Debian Wheezy and compiled Emacs 24.3.1 and am using it. I
naturally wanted to upgrade from flymake to flycheck.

I downloaded a flycheck 20140422.657 tar into
/usr/local/share/flycheck. Unarchiving it creates a directory in which
there is flycheck-pkg.el, flycheck.el, flycheck.info.

I didn't know how to install these files, and so tried copying them into
~/elisp.

I added a line in ~/.elisp: 

   (add-hook 'after-init-hook #'global-flycheck-mode)

But when I try to initialize flycheck with M-x global-flycheck-mode
I get:

  M-x global-flycheck [No Match]
 
How should I have installed the file? There weres no directions.

Haines Brown