I'm starting out in coin magic as well.
Use. A. Mirror.
I didn't believe my 'cover' for a Retention Vanish was convincing enough on its own. A month later, I used a mirror and it actually didn't look too bad--aside from coordination issues and whatnot.
But compared to card work, coin work is harder, especially since you're using a lot of one-handed work. And anything one-handed is angle sensitive by nature.
Start with half dollars and work your way up to a silver dollar, or work your way down to a quarter.
If you get more serious into coins, get yourself some older, 90% silver coins (walking liberties, franklins, and I think eisenhowers). This is because when these coins (because of the silver content and age) they make MUCH less noise than, say, a couple half dollars you'd get from the bank.
I hope some of this isn't redundant, but I'm excitable and just knowledge-vomited everything I know at this time.
Oh! And ALWAYS practice your Classic Palm whenever possible.
The easiest coin sleight is he hardest to master. Ain't that a slice of pie.