Chemical etching circuit boards isn't that hard. Below, I walk through the steps.

First, design the circuit board using a pcb software of your choice.

Second, convert the image to monochrome of the traces only.

Use a vinyl cutter to cut out the traces and transfer the vinyl to a copper pcb board.

Place the copper (with vinyl mask) into the etching bath. Remove it after the exposed copper has been etched away.

Use a drill and small drill bit to drill the through-holes on the board.

Solder the final components.