best beginner corset/ help sizing

i’m definitely looking at corsets from Timeless Trends or Mystic City, but i’m torn between which one to get. I don’t want a dramatic change like hourglass or gemini corsets, just something to knock a few inches off and that can be comfortably worn during my classes and stuff. my measurements are:

underbust- 32in

waist- 30.5in

upper hip- 35

lower hip- 37

underbust to waist- 9in

obviously i’m not very curvy, so i would like to get into waist training so that someday my waist will naturally be a bit smaller even when i’m not wearing the corset. i’m completely new tho so any advice would be amazing!