Welcome to the forum!

Google is the least reliable source of information on a lot of things, including how to care for your frog, well may be most pet stores would take a prize of being the worst.lol

you did good, fine coco fiber is the best substrate for them, you have all the other things for your guy? Dechlorinator, small tank, decor?

i would love to see pics of the guy when you have him! And thank you for asking questions now, before you even got the frogs, it will help you potentially to avoid tons of problems
fell free to carry on asking questions!