How to create order form, adding total quantity/price and add to check out?

I'm working on building an order form. I want to be able to order items with price attatched to field and create a total in checkout.

Do i need a payment method first?

You can create that with Payment integration and just enable total field:

All products you add will be added automatically to Total field.

If you have any further questions please let us know.

Thank you!