ESP8266 Community Forum

I have a project that will have 12volt power supply 5 volt power supply and 3.3 power supply. I was wondering do I run the 12 volt in and drop it to 5 volt and then drop the 5 volt to 3.3. Or do I take the 5 and 3.3 off the 12 volt. I been trying to find a help file for this but no luck. 12 volt fans and relays with another set of relays for 5 volt and of course the esp8266. Any help would be great. Thanks
Sprinkfitter