Here is an other recent project, full schematic etc of a gadget that displays a smiley face on a 5×7 matrix led screen which sings along with the music around.
Circuit schematic. The potentiometer at the very right of the schematic is for testing purposes only and not present on the pcb.
U4 is a temperature sensor and not used in the current program, so its place can be left empty.
Start by soldering the jumpers first. If you forget to install them first, then it becomes impossible later. the thick jumper at the bottom only connects the leftmost pin of the switch to the right pin of J1 connector.