regulator after manifold

I bought this keg setup and it hasn't arrived just yet. However now that I've learned that I will need a much higher psi to have soda in the other keg I want to add another regulator. Can I just put one after the regulator? That way I could just set the main regulator to the higher pressure of the soda, then set the regulator after the manifold to the pressure for my beer. If I can do this are there any extra items I will need?

yes. the only thing you'll need is hose and connections.