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My advice would be to get some decent content on your site then hit the social sphere though twitter, pinterest, facebook, stumble, reddit etc and get yourself noticed. Whilst thats happening get some other great conet that you could use for guest posing on other websites. these are just the initial steps, theres plenty more to do as Matt says. Check out Matts link.

Thank you Peter for your answer. Finally We are doing 301 redirects manually via htaccess. We hope not to change over the names of the categories. Best regards!