@CrazyG Well mostly the good habits are the opposite of the bad ones 🙂
But I think the key tends to be that there are a lot of options so you get a good variety of moves/buys turn 1 and the map plays differently every game. You want some randomness as well but not huge 50/50 battles that end up deciding the game the first round. Generally having some interconnected threaters of war helps make it so each player has different options on what to focus on.
Many maps don't actually do this very well and most of the moves are no brainers. NWO/WaW/TRS are examples of really bad initial unit/factory placements as the first 3-4 turns play out almost the same way every time to the point I've seen players take a save at say the start of turn 3 and just play from that again and again.
Probably TWW and Civil War have maybe the most interesting initial setup options as they tend to play out pretty differently every play through and almost every player has a different preferred opening. Once you get to UK1 in TWW, things can have played out pretty differently and the UK has tons of options on what to focus on (pressure France vs pressure Scandinavia vs support Egypt/Med vs support Southeast Asia) as well as what to build.