Sync audio and video, edit.

We have done a video for Facebook/Youtube. Just one song, about 3.20 minutes. Need to sync the video clips to the MP3 audio file. There are several clips for the same part of the song. Let me explain. As I play all the instruments and sing along with another, I have recorded voice and several instruments separately on Mp3. I have recorded visual with mobile phone sound (horrible ) so it can be synced with the MP3 audio. So maybe split screens? Sometimes simultaneous video clips? Anyway I would be happy to see what suggestiobs you come up with. As these videos don't earn anything price is a real consideration. Bob