customer relationship management

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I have to built a website for a computer service store. They have a system where they have all data about their clients. The website has to be on Wordpress CMS.

Now, a menu of the site will be : Check --> where clients can see the status of their device through their unique data which is : Name, Surname, Device ID.

All i know is that the company Use Dynamic Nav.
How can i get the status of the a specific Client device and show them the result?
How to connect MYSQL database of Website with MSSQL of NAV?
I the link provided i have the the schema of work:http://i.imgur.com/HDdjGXJ.png[^]

How to do all this step by step.
Where should i start, what do i need to do this?
Thank you in advance!!!