How to start a marketing agency?

I live in a developing country where we have minimal knowlege of how the internet can help small businesses. I plan to setup a social media consulting firm to help put most small businesses here on the map. It seem am having difficulty passing my message...

I've worked as an intern in an agency, and would like to be able to join one later on, if I move. Right now, I'm a big part of the marketing team for a Philadelphia start-up, but in the future I'm wondering what my options will be.

I'm 20 years old, so I understand some people may think I'm being naive by saying I want to "start an agency". However, I have a few years of digital marketing experience, worked as an analyst for a VC firm, worked with several startups on...

if your providing an essential services for a huge base of clients and you need to manage their digital marketing plans, what you shall do, start with? what are the targets you should have, how you should calculate your budget and profit margin?

I am digital marketing specialist looking for a partner for my start up

What are some "templates" of success. How have you used limited resources for attracting clients? Explain what a full service agency should offer.