Can anyone help me on creating Yammer network for one of our client. I have gone through so many links on google but most of the links are related to O365. Our client is not having O365. In future they want to integrate with SharePoint server 2013. Please help.
Not quite sure what difficulty you are having.
You can sign up for Yammer for free, but you have little control over it unless you are on a paid tier. Once someone with the @comaany address signs in, the Yammer space is created, and anyone with @company address can join. The users will get an email message to confirm they have access thru that domain, and once verified will access to Yammer.
If you are familiar with SocialCast, Slack, or other social tools, they are all similar with how the "free" part of the service works.