stepmania 5.0.10 gimmick creation

hello. i wanted to create something in stepmania 5, so i tried creating some stepcharts. i failed horribly, and i tried a lot. so i wanted to ask, is there some "begginer" tutorial for creating gimmick files for stepmania(prefferably 5.0.10) so i can také some songs and "gimmickify" it. i would start with something realtively easy like the magic torus or Wndrwll from ups pack and the continue. also i would specialize in making retrobar friendly so you would not have to look for actual direction of the arrow. i whink that would be a big contribution to the stepmania comunity.

This guide is what dbk2 wrote for the people that made gimmick simfiles for the U.P.S. tournament. It's a start.
Making a gimmick simfile is a lot like making a screen in a theme, so some of the stuff in Docs/Themerdocs/ is useful too.
Documentation is rather patchy, except for documentation of some of the newest stuff.

thank you very much for that :)