A book I found very helpful is; Piano Pedalling by Reimar Riefling, published by Oxford University Press in 1962. I got my copy from the Public Library. When I was young (about 60 years ago) I was never taught or allowed to pedal and only in the last few years, having taken up the piano again in retirement, am I having to learn how to use the pedals properly to get the correct sounds. What with sight-reading (the ability to memorise having gone some time ago), playing the right notes, in the right order, with the right fingers AND operate both feet using 3 pedals correctly - sometimes it's all too much for my ageing brain and eyesight! Still, it's wonderful to be able to play a reasonable repertoire for a few hours at a time and well worth persevering. Hope the book helps if you can find a copy.