been throwing knives for 4+ years now...
I use a custom matched set of Newt Livesay throwing knives.
most Chinese throwing knives I've seen are way too light and too short to be effective. it's MUCH harder to throw a short light knife, than a long heavy knife.
most critical part of getting started is figuring out correct distance to make knife stick. once you figure that out, next step is to get your stroke consistent.
some throw tip forward, some tip back. personal preference. try both to see which works best for you.
my preference is tip forward, holding on to handle. how you hold will effect number of revolutions knife needs to turn before hopefully sticking.
once you start sticking, then you will quickly figure out effects of moving forward or backwards on stick angle.
there's another method of throwing with no revolutions. works only for close up to maybe 12 feet. better closer.. deadly accurate with great force. I can hit a quarter sized target burying blade every time.
you need to fab a target with a large backstop when you start. after you get more accurate, you can get by with a smaller backstop. end grain from a large log works great.