How do i start a career in advertising?

It depends on the market in your city and country. I'm working for an outdoor advertising company, they rent the place from Major House, create the billboard according to the client's expectations (for this we intermediate with another company, I mean the creation part) and we post the billboard on the road corners's rent by us, on buildings etc. It brings a lot of money, and it's a hard work, too...Before I was working for another advertising company, dealing with advertising in catalogues, the costs are cheaper, but same is the profit. For this catalogue thing, you have to have a very professional team cause nobody trusts beginners, so they should be persuasive and have very developped communication and public relation skills as well as intermediating with clients. Never hire amateurs in such a job, cause it's a loss of money.