In many respects Test of Time is the same as all other versions. So a lot of what's in that "Scenario making for beginners" thread will apply to ToT too. In fact, there are also a lot of ToT-specific references in that thread.
The main thing you need is the cheat menu. Secondly, Notepad to edit the text files, and finally an image editor like Paint Shop Pro to change the graphics... So that's exactly the same as with all other versions of Civ2.