You may find helpful people/info at one or more of:

https://electronics.stackexchange.com/

https://arduino.stackexchange.com/

https://raspberrypi.stackexchange.com/

https://www.reddit.com/r/electronics/

http://www.reddit.com/r/hwstartups/

http://www.reddit.com/r/AskElectronics/

https://hackaday.com/

https://forum.nutsvolts.com/

https://circuitcellar.com/

https://www.eetimes.com/

https://makezine.com/

You might also find this book interesting:

https://www.amazon.com/Hardware-Hacker-Adventures-Making-Bre...

Amazon link without affiliate tag of a dead blog:

https://www.amazon.com/Hardware-Hacker-Adventures-Making-Bre...