How do I get a position selling Search Engine Marketing (SEM) services?

I do not have any certifications but I have some limited knowledge about Search Engine Marketing (SEM) working in a marketing job. I want to learn how to actually get a position where I either sell the services and/or set it up for the business. Also, where do I get the training to do this?

As the dfather of the marketing Philips Kotlor told in 1992 that the world will be services oriented after 2000 as there is no problem in productions as comnputer are there what now we have to find out the ways only for selling and positioning of the goods. So now all the four Ps in the marketing except production are r equired SEM that price, placing, and promotion.