What would users feel comfortable to see first in navigation

Reading about object-oriented UX and audience based navigation, I am still not sure how to approach the following problem:

I am building a careers section of a web site, where I must present job/internship/training opportunities by location and by profession.

My hypothetical flow:

I am intuitively going for profession first - that is, on the first screen, users would see boxes with professions (this is the so called audience based navigation).

Once a user identifies with a profession and clicks on the respective box, they would see boxes for jobs/internships/trainings.

Once they choose any of those, locations would show.

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How might I use research to see if my hypothetical flow is correct?

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