I agree with the idea of 'what did you use most at your relative's home' theory. I started out with a rotary cutter/18x24" cutting mat/ 6" ruler combo, white thread (dark blue and black also if you can), extra bobbins, size 11 sewing machine needles, fiscar's heavy duty scissors, seam ripper, sewing box, nice long pins. Got my pins from a LQS, not from local JoAnns. What I didn't have and have only just discovered was a walking foot for my machine. Had I known about it, I would've bought one years ago!
Welcome and good luck!