Go to >Control Variable >Game Data >Other >Steps
Let's say you chose variable 1.
Var 1 = Step Count
If Var 1 > 0, (u can replace this with Var 1 >= 1)
change gold: -1
Var 1 = 0
end
If you want it to happen throughout the whole game, just make it a parallel process common event. You set a switch to trigger it and you have it trigger from an parallel proccess event on the map the player starts in. Event page should look something like..
control switch [switch ID of trigger]
erase event
Hope this helps, and good luck on your assignment. Sorry if I was too late on answering, had to update my PC.