Aloha BenAlex,
The thinnest string should be th "A" string , then the second thinnest it the "G" string , then the third thinnest string is the "E" string
the thickest string is the "C" string, I believe..I hope this helps... MM Stan....
If you hold the ukulele upright or vertical with the neck up...the string order is GCEA from left to right.