Social Media Selling app, Like ebay, depop,quikr, poshmark + i would like to have admob added to the app by mylindapalmerr

I want this to be a selling app, like ebay, depop,quikr, poshmark, fab, wish and vinted, and gamestop power up rewards app. I would also like to have admob added to the appPlease give me your total cost or a close estimate… (Budget: min $5000 USD, Jobs: Android, iPhone, Mobile Phone)