My Combo Videos are usually just me going:
"Ok time to do a combo video"
*Training Mode*
"Let's find some silly starters"
*1 hour later*
"Let's find silly combos"
*1 hour later*
"let's do crazy damage"
*1 hour later*
"Let's slap some Music on this and call it a day"
Like the way I do combo videos sounds really lazy, but a lot of my stuff has been well received. I consider a CV more of a combo showcase, so I don't do too many "Set-ups" to show why the starter could ever happen, granted I have done it a few times, but the way I see it, if you don't know how to make use of the starter, why are you watching a combo video? Learn the game first lol