Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Sound › Recording Voiceovers › Hi Tysyacha- I use Final C
I use Final Cut, but most editing software is similar: in the Timeline, there should be an audio and a video section. In the audio section you want to create at least 2 tracks (one for the music, one for the narration). This way they both play.
It’s hard to advise you about the mike issue from here.
Hope that little bit helps.