Designing my first (tiny) MDF. I don't even know what I don't know. What are the best practices, or common mistakes to avoid?

My company is building a new branch office that will have 30-50 users over ~5,000 sq/ft of office space and 20,000 sq/ft of machine shop/warehouse. The building is small enough that it should all be serviceable from a single MDF without needing overly long cable runs.

So far the contractor has assigned a 10'x11' room as the "IT Room", and I've requested 25,000 BTU of cooling and 2x 30a 120v circuits. But now I'm getting to the point where I'm trying to understand how I want the patch panels placed, and where I want the rack to be, and I realize how lost I am with the "Layer-1" aspect.

The current ICP design has ~320 ethernet drops that I'll need patch panel space for, and 8 fiber pairs. I'll be connecting to 3x C9300 switches, and there will be a pair of DL360 servers and a couple of PA-3220 firewalls. Plus UPSs.

Where do you even begin with the physical layout for these kind of things? Right now I'm thinking of having a single 2-post rack for the patch panels and switches, and then a 4-post rack everything else. But like . . . yeah aside from that I don't know how it should be laid out or where.

Those of you who've done this before, what do you wish you'd done differently on your first time? What would you recommend I consider or read to prepare for babby's first greenfield deployment?