Creating training set to be used on classification learner

Hello Community,

I have some audio files used for training a classifer to determine between normal and abnormal audio, and I will be using the classification learner to do it.

I am new to the classification learner.

1) My data are already differentiated to normal and abnormal files. Do I train the files together, or normal and abnormal seperately?

2) How do I import all the audio files I have for training? Do I have to export them into the same excel file? Or can they be in seperate folders?

I have seen the video in the example below.

Machine Learning Using Heart Sound Classification Example :

https://www.mathworks.com/videos/machine-learning-using-heart-sound-classification-example-1515709249154.html