Didn't even know there was in-folder map editor, sweet i thought i'd have to download some cruddy third party application to start editing,You can make a basic map in literally 2 minutes. It won't really have an objective, but it's a map. And then you'll have 4318 more minutes to add that.
This tutorial is for CSGO but the basic rules apply.
Map editor should be located in "C:\Program Files (x86)\Steam\SteamApps\common\Team Fortress 2\bin\hammer.exe" (make sure you choose "TF2" in game selection
Ty for help! will look into this.