These were designed for a Stickman variant, but I've included posts for Lucky 13/Dummy 13 and variants. And a stand for those posts so they can stand alone. The arrow has double-sided sockets so it can point either direction.

I wrote the messages with acrylic paint pens which erase OK-ish with water and perfectly with isopropyl alcohol. (Poscas are the traditional favorite brand but Sharpie make paint pens these days too. Just be sure you have acrylic paint pens.) You could of course add printed texts if you wanted to. Light-colored pens do fine on dark signs.