What is the best form of advertizing?

Hello.
I was wondering what is the best form of advertizing for managed services. Some said that radio ads are good but they can be very pricy. I’m not very good at cold calls but I’m good to sell once the customers made an inquire. I just have hard time to be a telemarketer.
So I’m looking for a form on how to make the customers to make the first call after what I can deal with no problem. Also I see on an earlier post that some of you suggest choosing your market. How’s about if I want to offer MSP to any market. I do not want to limit myself only to the medical or accounting firms but to most of SMB. A server is a server no matter what business you are in and I believe that I can manage any network. Also I understand that if we go on Manage vendors then it will be more difficult to learn and deal with a vast variety of vendor from multiple industry but I’m planning to chose the vendors I want to support.
I was told to look in to Robin Robin’s marketing plan. Does anyone has any feedback on how good it is and how long it take until you get any results?
Does anyone recommend radio or newspaper marketing?
Thank you

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