You need MATLAB R2014b or later; see http://www.mathworks.com/help/matlab/release-notes.html#zmw57dd0e5692; the newest version has the most improvements.
To provide web service for your clients you need to comply with the MATLAB Terms of Use with regards to web deployment. It has been a while since I read through them; if they have not changed then you will need something like a Floating License (essentially the most expensive type of license that is not assigned to a particular user) if you wish to provide access to people outside your organization.
