How I make my videos
I mainly make all my videos with FlipaClip but to import the sound and music I use FilmoraGo these are both great tools for the job and I highly recommend FlipaClip for beginner animators.
When doing the actual animation itself though I need to imagine what my mouth would look like saying whatever the word is. For example if my character is saying No, then I need to imagine myself saying No as well. The reason I need the mouth movement to be the best it can be, is because it's pretty much the only thing moving, so that's what everyone is going to focus on.