I need short video clips edited together for exhibition stand loop

I have nearly 30 short video clips of golf maintenance machinery at work all mp4 files. Roughly 10 sec to 20 sec although a handful are longer
These will be played in a loop on a tv set at an exhibition I am attending.
I just need them all edited together in a sequence already determined. A few need to be cut as they are too long
( 4 or 5) but it's chopping rather than editing.
The clips fall into four separate categories. At the start of the categories it would be good to get a title name included.
Don't need a voice over or music want to keep realtime sound as I will mute it.
I have all the videos barring one in Dropbox folders. The last one is a lift from facebook
Basically just an iMovie job. Just don't have one of my teenagers around.
Would like to see the draft job and then be able to make a couple of amendments. Timescale is that I can have the project over to you within an hour of agreement. Need it back the next day.