I would like to add some music to a video clip I made (it lasts about 2 minutes). The video is basically some panoramic view of nature sights, nothing fancy. I am going to play a simple Sor's etude in A minor, Op. 60 no. 5 (actually, only the first part of it, before it switches to A major); I think that it's going to suit the mood of the video well.
The thing is, my video starts with a short "introduction" (30 seconds), where I film myself, my equipment, setting things up, etc. Therefore, I would like to make a very simple musical "introduction", maybe a sequence of triads, that sounds distinct from the main melody and conveys the feeling of "setting things up".
I thought about just recording the process of tuning my guitar, but I am afraid this would sound ugly; I want the introduction to be compatible and somehow "lead" to the key of the melody (A minor).
So, how can I make such a melody? Also, is there a name for the thing I am trying to make?
P.S. I have absolutely no experience in musical composition.