Adafruit USB C Breakout Board - Downstream ConnectionAdafruit
This breakout gives you all the basics you need and a resistor configuration that mimics classic USB 2.0 for a downstream connection
The two 5.1K resistors on the CC1 pins indicate to the upstream port to provide 5V and up to 1.5A (whether the upstream can supply that much current depends on what you're connecting to.
For most usages, you can just connect VBUS to your 5V input, GND to ground, and D+ and D- as you expect. You can monitor the CC and SBU pins to determine cable polarity, or send side-band data. Or leave them disconnected