Free advertising Trial Offer for Google Adwords

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Hi Guys i just receive a post at my home and got another letter from google(the first one was of my adsense account verification one) it say that "we are offering you upto Rs6,000 worth of free advertising ** to give it a try" well i have no clue what i can do with it it has a coupon code and offer code with it well it says upto and also ** so i am not sure what it will be well any one with any experience of this need you tips and help and have no such experience then what do you think and also i have a blog about ptc site can i promote it there (which i think would be not possible) or should i promote clixsense or may be mylot if they allow it or may be i am entirely wrong and its worthless to me Any Suggestion....