Haha I medically have an EXTREMELY short attention span, so get where you’re coming from.
Etcher is used fo write the image, as opposed to creating images. You don’t need to make an image so to speak “YET” - do that once you get things customised just the way you want things. 
You’ll want to have a copy of the latest OS on hand to write to the SD as well as the Etcher program. The new Os 0.5 is no doubt newer than your current one, with many new features.
You don’t even need to write it on the 16GB card your game shell came with. You can buy a new larger one from the shop as long as it’s at least a class 10 SD micro card.
@tor.sh Yeah! The wiki is being populated by a new user. It’s coming along nicely.