People love stories. Firstly, you should build a campfire. Telling cases, sharing know-how will make you an authority in industry (in short time). You -must- be active on related communities. An example if you’re selling and online marketing product, you -must- be active on inbound.org, growthhackers.com, reddit.com, quora.com, reddit.com, etc. Also with this way you will increase your lifetime revenue. Win-win!