Read "Fanatical Prospecting" by Jeb Blout. You'll need to make more than a few dozen calls - more like 100 per day. Every day. Keep doing it and you'll learn. Severe amounts of rejection are just part of the job. Shrug it off and keep making your calls.

Hunter.IO will help you find decision-maker email addresses. MixMax.Com and similar services will alert you when your cold emails are opened. Keep your emails short and to the point.

Blogs and ebooks are fine - everyone does them - "inbound marketing" is the easy way because you're not going through the pain of rejection. However, this is not the easy way. You'll spend a lot of time of SEO and online promotion. It's way easier to just pick up the phone / email and call.