Replacing Teapot with custom image

Hey,

I've just started to explore AR development so I don't know nothing. I want to replace the teapot 3d model with a 2D Image where I will show informations about the marker. How can I do that? Create a plane with the texture? Is it possible to have transparency?

I already found some informations on this forum, but they are not updated, on the topics that I found here is quoted some .cpp files that no longer exist on the sample app.

Thanks for any help.