What are you looking for? Do you want it open-world or do you want it more close combat CQB style?
Start by finding a reference game that matches your idea best. I.e phantom forces or arsenal or something. Notice what the devs pay more attention on, build the larger, more detailed things first and then go onto the more trivial things.
You need to know that in building, 99% of the time your build wont look good at all until it’s finished, so if you’re having issues with that, complete your build first.
I’d start with the main part of the map, where people will intersect most. Players don’t meet at the spawns do they? There’s a main area that needs creating, develop it with detail ensuring that it isnt one sided at all, then expand out from there. Ensure theres adequate cover, ranges etc etc and tweak your guns around this build i.e ranges.
Is this a good layout?
Yellow is the enterable buildings, purple is the non enterable buildings, blue is the doorways and green is walls/ how tall the building will be.
That map feels a little bit too congested and small for 10 players. Try expanding it a little bit - don’t expand it too much because then players will have an issue meeting.
I tried it and this is what I got! What do you think, and what should I add? (Just so you know, the map is meant to look like it could’ve been made in the year 2014/2015)
It is a good layout in my opinion. I believe you could spread the enterable buildings out a little bit and make them less tall. Also, it depends how many people will be playing in that map; I would say that map can be sufficient for 7 or less players.