First apartment - what info do I need to determine a good deal?

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Hey guys, 

I'm looking to buy my first apartment complex and I'm in search of some guidance on what exactly to do first. I found a 34-unit complex in a quality area. I have some basic info on the property such as cap rate, GRM, price per unit, and NOI that I got off the online posting.

I know I need more information like a rent roll, occupancy rates, economic occupancy rates, history of expenses and maintenance. And I definitely know I need to walk the property, probably multiple times. 

But I am unsure of what I should do first?? Do you just call up the listing broker and say "hey I need all this information and I'd like to come see the property" or what?

I'd really appreciate any feedback.

Thanks,