Google Adwords is such a tool, where you don't need to work too hard to rank your advertisement. Just a few steps are necessary to do before placing ads, in order to get good results.
Firstly you should select keywords from the country you are targeting. Afterwards, you should check for keywords with low competition told by Google Adwords. This is not the keyword competition but the advertisement competition. The best practice is to use a Low or Medium Competition Keyword. It will help you generate more benefits from that particular advertisement. Moreover, Bid will also be of low cost and you can easily afford it.
Ads with the highest CPC bid and quality score will get ranked on the first position. Other factors that are taken into account in the ad ranking are relevancy of your ads to the user's search queries, optimization of the landing page and relevance of the keywords you use in the text.