E-Commerce selling from india to globally?

I'm starting an ecommerce clothing website globally with a basic Shopify plan from next month in India by integrating with Printful, since I'm integrating with international print on demand services with Indian website, do I need to take any steps to follow like tax and custom duties, Let say if any customer purchase from my website and I don't want my customer to pay charges of custom duties instead I wish to handle for that so what I'm supposed to take a step?? And can anyone do suggest me about the shipping apps to deal with for international? And can I update my website with different currencies based on customer view page as they planning to buy in their currencies? Example: in India can they see INR in the web page? Can anyone please give me an advice to proceed before start up my business. I really appreciate the help upon this request. Thanks in advance.