Preprocess metadata and wavs in finetuning

How should I preprocess metadata and wavs? I want to use vits2 to finetune and it says in readme that **You can prepare metadata.csv with python script if your input data has different format**. But what script should I use? And how to make my wav files in right format? I see **.mel.pt** in db-finetune folder, when i downloaded it. But I can not understand how to add this files to my own wav files