I Would Like To Start A Small Grassroots Advertising Agency, How Would I Go About Starting & Getting Clients?

I know in todays economy everyone is cutting back on spending, especially businesses by laying off employee’s. However there are still print and television advertising still being purchased. I know what it takes to start a business, however I would like to know what it takes actually start a grassroots advertising agency? What does it intel? Creating creative ads for clients, being familiar with places and cost to advertise? What would I need to do? Any information would be helpful.

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