PCB design, where to start?
I think your best bet is to start with a breadboard and jumpers.
Look for schematics on the internet of designs similar to yours and mostly copy them, making changes as necessary to adapt to your application.
Buy the components from mouser or digikey. Make sure to get through-hole parts. Check out sites like sparkfun and adafruit for &quot;friendlier&quot; (but fewer) options.
Get it working on a breadboard (it probably won't work the first try if you're rusty).
Then make a schematic of your breadboard design.
..Now you're ready to start thinking about making a PCB.