I see that you're a new member here. It's customary to only make a thread when the villager is ready to move out (or already in boxes) so that everyone knows what villager you're selling.
You should post in the introduction thread! This forum usually works like this: people only create auction/selling/giveaway threads when they know exactly what villager is moving out. Since the villager you want to auction off could be any one of the 300+ villagers in the game, no one will know if you have the specific villager they want!