Honestly, as long as you don't over analyses every single detail, you can contact your coach as often as you want. It's normal that at the beginning (since you are just starting to take private lessons) that you will have a lot of questions and you will seem to think you are taking a lot of the coach's time, but this is normal and all coaches should be expecting to put in a few more chats with new skaters/parents then with skaters/parents they have been dealing with for a while. Talking about your goals is fine, and it actually very necessary so that you both work towards your goals. Don't worry about taking too much of your coach's time unless you think you are actually being unreasonable.