what type of music license to buy?

I’m new to Audio Jungle and my question is this… I have a online training business I just started and need an audio soundtrack for a video training series. 10 videos total. I will sell the videos to other dealers to download or stream?? and thoughts?

I’m sure someone will be more knowledgable on here but from my understanding, it seems to be down to audience size and number of copies you expect to sell of these videos.