I didn't throw the discus much I couldn't get it to fly straight, but I did throw the javelin. There is a good chance they will start you out at the stand and throw and then the three step throw. I was a little impatient and on my own time I worked on the full run and throw.
Once it feels a little bit normal get with the coach and get his or her opinion so you don't develop to many bad habits. A pair of javelin boots helps as well. (Sometimes they can be a little expensive) hope this helps a little bit and good luck on the put coming session.