FBA is restricted for new sellers until December 19th to keep from having problem shipments from inexperienced sellers.
If you do choose to self-fulfill, you will list your products the same way; just specifying you will fulfill and not Amazon. Then, when an order is placed, you will be notified and show ‘Unshipped’ orders on your seller account.
You will then need to purchase shipping and ship the product. Depending on the type of products, you will likely find USPS to be the lower cost option. For items with a shipping weight of less than 1lb, USPS First Class will cost you a few dollars.
Your going to have to do your homework with regards to shipping costs. USPS has many flat rate and regional rate product offerings. You also need to do your homework on how to ship (i.e. padded envelope, box, etc.). On the USPS, UPS and FedEx websites, you can get pricing quotes so you can better estimate your actual shipping costs, and then price your items and shipping costs as needed.
There is not a one-size-fits-all shipping options for sellers. Your going to have to do some research and testing to verify options and costs.