What does TC load on startup?

Well the title pretty much says it all, what does TC load on startup?

And if I use the disables table for lets say Kalimdor then it wont load creatures, vendors, quests, etc. on map 1?

If you look at the console (or Server.log and DBErrors.log), you’ll see loads of database content that gets loaded. Map, vmap, and mmap data get loaded as needed by the core. Same for creature/object spawns for the map grid that was loaded. With enough RAM (at least 16GB, if not more), the grids can be set to stay loaded, too. Otherwise, a grid and its contents are removed from memory after 5 minutes of no player being in that grid (if I remember correctly).