Concert composition is something you pick up with experience.
I used to manage my friend's band and had to make up the performance schedule for their gigs, and at first they weren't all that great.
It's a good idea to start with something exciting, then go to something with a fun bridge, slow it down with something sad, and ride that sadness with something soft and hopeful.
There's no right away to end a mix tape, it just depends on the type of taste you want led in your mouth.