Shopify store marketing

This is my Shopify based store and selling appeals the rang from $50 - $100 [login to view URL] I want to market this store Australia, USA, Uk. You can market on Facebook and Google. Give me answers: How much budget we required for ad spend? What kind of things you need before starting marketing on FB and google? What will be your service charge? Will you create ad creative as well? You need to show your past work and share your service charge. One more thing, will you use my business manager for marketing?