As you can imagine, this list could be very long! We have tried to limit it to the absolute essentials, those things we could not do without and that we use pretty much every time we sew.
Needles (various sizes), pins
Sewing thread in a variety of colours, matching or contrasting depending on the project
Rotary cutter and cutting mat
Small scissors for cutting threads etc
Sewing machine (with attachments)
Sewing machine needles, bobbins
Something to mark fabric such as erasable fabric pen/pencil/chalk