We use Unreal Technology at White Paper Games. If you’re wondering which engine to start with I would recommend UE4! It’s FREE to jump in and start learning! You can find more information on UE4 here: https://www.unrealengine.com/
Industry
It’s important as a Game Designer to digest as much about the games industry as possible. Here are a few links that I constantly go to for knowledge and insight:
Idle Thumbs (Podcast)
Tone Control (Podcast)
Gamasutra (Article)
Level Design.org (Mixed Media)
GDC Vault (Video / Audio / Powerpoint)
Designers
There are lots of really great Game Designers in the industry that have personal blogs on their thoughts. Here are some of my inspirations:
Harvey Smith
Clint Hocking
Steve Gaynor
JP LeBreton
Robert Yang
Forums
Forums are a great place to get help on any problems you may have. There are a lot to pick from, however, here are a few where I have had the greatest response. Remember, to get help, you need to provide feedback to others!
http://www.worldofleveldesign.net/forums/
http://forums.epicgames.com/forumdisplay.php?f=20
http://www.mapcore.org/
http://www.gamedev.net/page/index.html