I want to insert ads in an HTML5 game using Google IMA SDK and DFP like here. I managed to display video ad following the guide (even though it's for video content) and looking at how it's done in the game mentioned earlier. But I'm using sample ad tag from the guide:
http://pubads.g.doubleclick.net/gampad/ads?sz=640x360&iu=/6062/iab_vast_samples/skippable&ciu_szs=300x250,728x90&impl=s&gdfp_req=1&env=vp&output=xml_vast2&unviewed_position_start=1&url=[referrer_url]&correlator=[timestamp]
and not the ad tag generated in the DFP. If I insert it instead I get an error The VAST response document is empty.
. Probably I messed up something, since I couldn't find any guide how to insert such ads from the beginning: where to sign up, how to generate tags and so on. I heard also that I must send to Google an example page for approval. Where? What page?
It's all so confusing, tutorials are mostly irrelevant or outdated and I'm newbie at this, so I'm asking: is there any up to date guide about it, or could someone at least write what should I do step-by-step?