tips for working on auditory training

Good day everyone, I'm a percussionist. I came to a community where there isn't much material to play, so I decided to start transcribing band music. I've begun studying a bit and have done very few transcriptions. I'd appreciate some advice on ear training and, above all, on what I should study to produce good transcriptions. I want to help the community I'm in and share my love of music. Thank you very much.