The art of supplying material with correct type of tests and certificate is always to maintain and have an open conversation with the end user. For all questions you have, the end users have the answer. To move forward you will have to be fast, accurate and show initiative.
In stead of asking what you should do, find out what you could do at what you believe is minimum required, and for what cost and time. Formulate then your questions as a proposal: 'To fulfill your requirements we are prepared to do tests x and y, certified with certificates type xx and yy. Other tests and certificates are as far as we understand, optional and not required. We need your accept and/or comments within aa. to fulfill a deliverytime whithin zz.