Hi Lucy and welcome to the forum.
Once you start looking closely at these small circular metallic pieces of art it does get a little harder to forget them thats for sure.
Check out all of the books in the banner above, they all make for good reading and a great intro to collecting, then acquire what you like the most.
The best words of wisdom are echoed time and again on here, buy well, not for the sake of it - many lower grade coins make an accumulation rather than a collection