There's many forum threads on Star Seller that you may want to read. You can also look at the Q&A located in your Shop Manager dashboard > Star Seller.
Here's what an Etsy Community Specialist has posted in several threads regarding Star Seller:
"We suggest using the Forums' Search function prior to posting (just be careful to not bump an old thread that hasn't seen any activity in the last months/years), as questions regarding the Star Seller Program have been extensively covered by our fellow members since its launch, as well as our official Star Seller Guide, which contains in-depth answers to some of the more common questions regarding Message Response Rate, Shipping, Local Pick-Up, Digital Orders, and other topics. You can check it out here: etsy.com/starseller. "
