So... Tell me what they are in your language(s). I'm looking for things like "umm", "hmm", "uhh", "wellllll", and so on. A transcription might be nice, but I can manage to interpret a lot of writing systems, so don't worry if you don't know the IPA or any alternative transcriptions! If however, you want to provide spectrograms and formant frequencies, that is perfectly okay by me.
Also, is there a better term for these words than the ad hoc "um"-words?