I would stock fabric I want to own and make quilts with essential notions and good quality thread.
i would also find a group of quilters who could do classes for me in part of the shop using fabric from my shop. To begin with get quilters to make bags to carry cutting board and 24 inch ruler. They could do classes during the week or weekend. Need two kinds of classes newbies and established quilters with more difficult projects.
also see if you could get some dealer to loan new sewing machines with the aim to sell them. Also try to find a sewing machine repair man whom you can send machines from your customers.
Make a club where people can come if you have room to sandwich a quilt. Space at home usually a problem
last a person who can make the shelving, ike a good, and who will support in all ways
lastly plenty of quilts bags etc on show to show what you do.