Gardevoir OC Estela (Patreon)

So i made a new Gardevoir OC her name is Estela (or you can name her), my plan is put her in adoption but I've never done an auction so I don't know how to start ... I know I have to put a minimum price and a maximum price ... but still I don't know how much it would be lol.

Patreon October folder:
https://drive.google.com/drive/folders/1EOKuCpt42RP2C8MMUiPb3Y1Bx4CzQvdn?usp=sharing