ReadyToShip is currently designed to import orders from your store, and update tracking numbers back to them.
Currently we do not have the facility to manually create an order.
We recommend creating the order in your webstore/marketplace account and letting ReadyToShip import it from there.
Most webstores have the ability to recreate or duplicate an order, so this is usually a quick process. An added advantage is that inventory counts are often better managed this way.