Familiarize yourself with the two sizes of USPS large flat rate boxes (LFRB) and also go to fedex.com and open an account. There's no downside to opening the fedex account it will save you beau coup money when shipping items too large for flat rate boxes. You will also use the SFRB and the two MFRBs. And finally, USPS regional shipping boxes are an over-looked method to ship also and although you won't use them often, sometimes they can be the lowest cost method for smaller orders. The term "regional" is very misleading and for now you might not want to concentrate on learning that method because it will only constitute a small percentage of your shipping and perhaps none if you never ship bottle stoppers and pen blanks etc.
