Help with my website

I need help with my Shopify website . I have had it for years and everything has changed. I need to change my products as well to a different provider. Can someone help me as I have 2 new orders and O do not know how to fulfill them. Thank you.

Here’s the documentation on how to fulfill orders: https://help.shopify.com/en/manual/fulfillment/fulfilling-orders/single-fulfillment