Required eccomerce website with mobile app

My website name is allenturtle.com I made on wix I am not satisfied I want on wordpress in which I can do gst modue varation with respect to each product with diferent tax modules.
I need website like inephos.com
with good speed
Required all features like invoice generation with logo
We can use theme and can develop website .
I need website with all basic thing so that customer can come on website and can buy with good marketing