How to create your own ttt map?

Hello,
I know that there are certainly several threads in which this topic is concerned. But I'm looking for someone who briefly explains how I put the map editor and use it.

But I will only start in a few weeks to create a map.

Things I need help with:

1. Setup Hammer Editor
   
2. Create own Textures
   
3. Use Hammer Editor
   
4. Create treator rome and traps