After looking them up for a long time, I finally decided to take the plunge and buy a cast iron skillet. After it arrived, I cleaned it in hot soapy water and scoured it, to remove the wax coating, as per the instructions. I wiped it dry, then popped it in the oven quickly to fully dry it. After this, I took sunflower oil, and coated the entire skillet. I then let it sit in the oven for an hour, at 200ºC. When I took it out, the coating was uneven (I now know I put too much oil), and was reddish-brown!
I think I managed to get it rusty within the first day of owning it (pictures below)!