The few things necessary for Crowdship to work are:
Crowdship app installed and configured on your Shopify store
Crowdship products imported into your store
Fulfillable Orders with Crowdship items - orders that are marked paid, and have a customer with a shipping address
Once you have paid orders that have Crowdship items, Crowdship will automatically pick them up, charge your card for the cost, and have them fulfilled.
Once the Supplier fulfills the order, a fulfillment update (with a a tracking number where available) will be automatically be updated to your store.
That's all!