“If you try and lose then it isn’t your fault. But if you don’t try and we lose, then it’s all your fault.”
― Orson Scott Card, Ender’s Game
To start a game, the first thing you should and must have is an IDEA to be precise a GAME IDEA.It can be a new one or an extension of an existing popular game or an idea generated while playing a game.To have all this you should first TRY.
Joe : Ah ok!!! I Tried and have an idea what’s next???
Gamaster : Put your idea on a paper (SKETCH)
Joe : I will do that… But…. i don’t have an expertise in graphic designing and also i can’t hire a graphic designer.
Gamaster : Hmmm…Why don’t you try with Free Assets ? one’s without license headache.
Joe : Where to get them?
Gamaster : Let me give you some pointers to start with (links)
Photos/illustrations/Audio/Video/Fonts – Link
Assets for your game (Reddit) – Link
20 Best Free Art Resources for game developers – Link
2D Graphics / Textures – Link
Game Design/Ideas/Graphics/Art/Sound/Fonts/Maps–Link
GLITCH is dead but Assets are still ALIVE – Link
Free resources for Games/Apps – Link
Unity3d Asset Store (Search for freebies) – Link
More :
Game Icons-Link
Art Assets For Gamedev-Link
Free+Paid – Link
Gamedev Wiki List-Link
Note: The above links are just to guide you to start your game.Please carefully go through the license agreements before using.These links internally will point to multiple other links which in some cases are repetitive.
Please feel free to add any other links which you know/use in your gamedev.
Please credit the designers/websites by following their twitter/Facebook accounts.
OneStopDotnet 
Thanks for these links. http://www.unluckystudio.com is also hosting free game art every month. So I hope more Indie developers can kickstart their projects
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Thanks for links!
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