setup a squeeze page to offer something to your prospects for free in exchange for their contact information.make sure it is high quality free offers such as ebboks,videos,audios or webinar replay video.video or audio tends to work better for list building because it contains higher perceived value.

then drive traffic to your squeeze page.you can use PPC but this is paid advertising.some people are using CPA offers to obtains leads for them.

free traffic would be such as going to warrior forum and start commenting on the people's thread.but that doesn't mean you simply write junk comment and spam the thread because you will be banned.put the link to your squeeze page in your signature so whenever you post comment your signature which contains link to your squeeze page will be displayed.so people will start to notice at what you are offering.

you can also do simple video 5-10 mins teaching people how-to information and include the link in your description.you can tell them if they would like to get more free tutorials they can go to your website link that is provided and put in their email so that you could update them whenever you create a new tutorial