How i can make a theme?

Y'know, im a noob but that doesn't mean i can't make a theme...

Please, ¿someone knows how to make a theme?

A lot of time, effort, knowledge of coding (be it .lua or .xml or whatever), and not changing an existing theme's color and calling that a new theme if you actually want something with quality.

If all you want to do is change the graphics, find someone who is already doing the code half of making a theme and ask them to use your graphics.
If you want to change how things behave, I suggest starting by learning lua in a standalone environment where you won't be distracted by the idiosyncracies of using lua in stepmania.

First you should have these:
1.Graphicing software(like Photoshop).
2.Coding tools(like notepad,XD).lua doesn't need a special tool to write.
3.Time.

Then make a design of your theme and learn how to use codes(Or get codes from other themes).If you don't know anything about lua,just change graphics and of course,metrics.ini.

Too much things to learn if you want to create a theme by your own.I suggest first ask for another theme's permission and change it(like D3NEX,based on waiei.So it has the same great waiei system.)