How do I run a Godox iM30 flash off camera as cheaply as possible for macro photography?

Hi, I have an Olympus E-M1MarkII, and a Godox iM30, and I want to be able to use it for macro, handheld probably about 1 foot away from the camera, just to get a better angle. I don't mind if there is a wire, it doesn't have to be wireless or anything, and it's not an automatic flash

I don't normally do any flash photography, I only do landscape and macro, so I wanted to give this a go but I have spent hours researching and there are so many different complicated and expensive ways to do this, and so many different types of connectors etc... that I am just totally swamped by information, so plz help :) what's the cheapest way to run that flash slightly away from the camera?

thanks for any advice