You can make black decals on any laser printer, and white ones also if you buy a "Ghost"
https://www.ghost-white-toner.com/
cartridge and have a laser that accepts them. You can make the text artwork in MS Word if you have to. MS Publisher is better because you can kern in it. Or you can also make artwork in a vector drawing program if need be. Hands down, the best decal paper I have used is here
http://tangopapadecals.com/paper.htm
Once printed, you need to lay the sheet out flat and spray a few REAL LIGHT coats of clear lacquer or some sort of artists clear sealer on them and let it completely dry before trying to use them.
More serious decal makers tend to use the dye sublimation printers, but that is a whole other story and is not really necessary for someone making a few decals that they can't get elsewhere.
