Sharp scissor, use them for nothing but fabric and thread, NOTHING BUT! Pinking shears, a seam ripper (unfortunately you’ll need this) and a rotary cutter which makes cutting go quickly. Be careful you don’t cut off any body parts with this!
A tape measure, you might want one with metric on one side and “standard” on the other. Be sure it is at least 60” long. If you use a rotary cutter you’ll need a self healing mat. My favorite is the 24”x36”. Also, a larger acrylic cutting square; I use Omnigrid. The size I use most is 14”x14”.
You’ll need regular machine sewing thread that coordinates with your fabric. Also, upholstery or clear thread for easier gathering. Maybe some elastic thread for shirring. Overlocking or serger thread spools if you have a serger.
Machine needles, dress making pins (straight pins), hand sewing needles and safety pins. It's up-side-down but blogger is going to make me crazy if I reload it againa...
Fray check for ribbons and a fabric pencil for marking on your fabric.
A regular sewing machine, a serger and an iron and board.
Now, remember you may not need all of these things, these are just the tools I use often enough to mention. Feel free to comment if I left something out that you typically use or find helpful!