If you are looking to get started with Google Adwords and are looking for a coupon than have a look at below screenshot
Have a look at below YouTube video to get started with Google Adwords
Terms and Conditions
If you choose the pre-pay payment method, you must make an initial minimum payment (currently Rs. 500) before activating your coupon. After registering your details, you will be contacted via phone or email by a Google authorized representative in the next 1-2 business days.
In order to activate this offer, you need to enter the promotional code through the Billing tab in your account before December 31 2012. Promotional codes have no promotional value and entry of the promotional code serves only to begin your qualification for the associated promotional credit. To qualify for the promotional credit you must accrue advertising charges in the amount of INR 500 within 31 days of entering your promotional code.
For example, if you enter the code on November 30 2012 you'll have until December 31 2012 to accrue advertising charges in the amount of INR 500. In all circumstances, you must enter your promotional code before December 31 2012 in order to activate this offer. Your account must be successfully billed by AdWords and remain in good standing in order to qualify for a promotional credit.
The promotional credit will be applied within approximately 5 days of your account reaching the threshold for accrued advertising charges specified above, as long as you’ve activated your account using the promotional code and fulfilled all requirements stated in the offer. Once applied, the promotional credit will appear on the Billing summary page in your account.
However note that this offer is only for new publishers and old publishers are not allowed in this campaign.