We're going to redesign the company's website that I work on but I have a lot of menus and different services to organize

We offer all these kind of services:

Education Short-Term Courses, Certificate Programs, University, Distance Learning

For Companies In-Company Training, Product Development, Research, Workshops, Financing, etc

We also have a TV program and a publishing company.

For each of these things we have many technical areas like: chemistry, mechanics, Construction and Building Technology, Manufacturing and Engineering, Information and Communication, etc. Spread over 90 unities across the state

I dont now how can I create cards for my Card Sorting Session, because I can be very specific like "Basic Excel Training" Or not like "Software Development Courses"

How can I decide what level of cards Im going to use? And What granularity could I use?