For installation use GNU Stow. It's excellent for managing symlinks from the dotfile folder to the real location of the dotfiles.
For a tutorial how to use Stow have a look at this blog entry from Brandon Invergo.
Or have a look at this video.
The vim plugins I'm using aren't shipped with my dotfiles. You first have to install the vim plugin manager Plug which I'm using. Then you can install the plugins via
:PlugInstall
For more Information how you can use and install plugins with plug see its github page.