These coins can become highly addictive. I originally started by only wanting the Category 1 and 2 coins which are fairly affordable. Then saw that there really weren’t that many Category 3 coins and worked on those. Now I find myself wanting to “collect them all” 
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The coins are split into the category system that was created by Gus Lopez. Here is the link to his excellent guide that I highly suggest checking out.
The Comprehensive Guide to POTF, Droids, and Ewoks Coins
Category 1
Category 2
Category 3
Category 4
Category 5
Prototype
Droids
Ewoks
