Good choice since they are a amazing cards, normally these collections have got some sort of list on bulbapedia but these seem to lack that.
Here is the guide/list that I used when I started: www.psacard.com/articles/articleview/9880/psa-set-registry-collecting-japanese-poke-mon-corocoro-promo-cards-beginning-promos
There is a lot of info on the fourum itself on different variations such as: www.elitefourum.com/t/japanese-ivy-pikachu-reprinted-corocoro-variant/29544/1