You can see what the island contains while viewing the package on the store. Feel free to check out which one you'd want with the images that the store provides.
if you meant whats inside of each island's chest? if so then click this link http://itsjerryandharry.com/threads/all-island-chests-skyblock.96116/#post-904238
You can see the ores by going to the skyblock spawn, there are representations of islands around main spawn. The only islands that have ores hidden inside are VIP, Legend and Herobrine (correct me if I'm wrong) which has diamond ores.