I really don't know all too much about making things like that I don't know how fimilar you are with Architect of the Future's work, if so , I want to make signs like he does, like the signs on the wall.
Start by making a table as advised in the start to finish tutorial (in the tutorials area in Object Meshing). Then open up the stuff you'd like to emulate and look how it's done. Once you know the basics, you'll probably be much better prepared to do what you want, and to understand how he's done his.
I was searching for how to make signs today, and then obviously I came across this thread. Ideally something like the signs in Minecraft would be what I need. I would like to choose a blank sign, then place it. Afterwards, a dialog would pop up in which I would type the text that I want on the sign. After I close the dialog, the sign would be permanently populated with that text. Is that functionality even possible?