Refresh current website and add Squarespace online selling platform

I am looking for a creative designer to refresh my current business page. My business is in Education. We teach after-school Art programs for kids. I would need a secure payment portal and be able to create a roster as well. Secondly, I also sell my handmade Art online. I would like to create an extention of selling my Art from my exisitng website at www. jimmypotters.com