Add to Cart (linktoform but select products to include in the form first)

I was trying to make an online ordering app for our store something like mcdonald’s delivery except for groceries. I tried to make it simple by asking for customer details first so the next views/forms should then be pre-filled or pre-filtered by the customer’s name. but i can’t seem to find a workaround with my ‘add to cart’ action which links the products-list view to order-form with customer-id already pre-filled.

also, i am unable to add a pre-filtered view of the cart where customers are able to complete order.

any thoughts will be appreciated. thanks in advance!