Just one or two clients is not really enough to make a good portfolio. But in a site of your own, you could explain what you do (philosophy), what you offer (services). Don't advertise prices, as each project will (and should) have its own price tag, depending on the difficulty and vastness of a project.
You could put a link to your own site on the sites you make for your clients. People who like those sites, may be interested in hiring you.
You could set up a portfolio page already, or when you'll have enough to show.
And you could start an AdWords campaign. For more about that, see
https://adwords.google.com/select/Login.