How to edit HTML in Vim?

Question

I'm new to Vim and I'm trying to get used to it. I just created a .vimrc file and got Vim to display line numbers and do incremental searching. I also enabled syntax highlighting. Now I want to enable things to make writing HTML easier. I searched for html.vim in /usr/share/vim and found this:

/usr/share/vim/vim72/syntax/html.vim
/usr/share/vim/vim72/ftplugin/html.vim
/usr/share/vim/vim72/indent/html.vim

Now, what do I have to do to enable HTML auto indentation? Copy those files to ~/.vim? Symlink them? Or does Vim automagically load them from /usr/share/vim/? (It already does HTML syntax highlighting, so I think that's possible - but it doesn't do HTML auto indenting) I heard set autoindent in .vimrc would do the trick, but what's with .c files? I thought they needed set cindent, but does cindent work with HTML?