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Yes,Since these errors (like Duplicate pages,Titles or 404 not founds) are impacting your pages negatively,without correcting them it's to early to talk about improvements.Try fix all errors first and then go to each page individually and start to make your optimization with your researched keywords.

First of all as soon as you get your report,try to fix all errors mentioned asap and then move forward

If you are using All in One Seo plugin,You can fix the problem,by changing the settings of plugin.

Hello Greg

First of all you  have very nice site:

About 416 pages of your site indexed by Google,but you don't have Blog in your site.Try to make a Blogs and keep adding new posts with fresh content by using your targeted keywords. You can do your on page SEO yourself,by following SeoMoz Campaign suggestions. Try to get back links to your new created pages and posts by submitting articles to high pr directories and blogs by pointing links to them,not only to main page.

On off page optimization,since it takes time,you can outsource to reliable link builders.You can use forums such a Warrior, Digitalpoint or others to find reliable link builders.But before chose them,check their reviews,left  by others,ask for example works they have done.

You can try Odesk.

Always it was the best outsource site for me.

Page content is a same as old index.html. How about those 70 links to inner pages?

About 3 weeks ago I converted index.html to index.php. Both are 301 redirect to main url. Also I have about 70 links on main page pointing to internal pages.

The Website is about 11 years old,and was on active link building .

Is this conversion from html to php and also 70 links pointing to inner pages will affect on ranking?Since all links are passing juice to inner pages.

Hi Benjamin

Try to make new blog sites by using your other domains and start active blogging by sending links to your .com site

Hello Greg

First of all you  have very nice site:

About 416 pages of your site indexed by Google,but you don't have Blog in your site.Try to make a Blogs and keep adding new posts with fresh content by using your targeted keywords. You can do your on page SEO yourself,by following SeoMoz Campaign suggestions. Try to get back links to your new created pages and posts by submitting articles to high pr directories and blogs by pointing links to them,not only to main page.

On off page optimization,since it takes time,you can outsource to reliable link builders.You can use forums such a Warrior, Digitalpoint or others to find reliable link builders.But before chose them,check their reviews,left  by others,ask for example works they have done.

If you are using All in One Seo plugin,You can fix the problem,by changing the settings of plugin.

Hi Benjamin

Try to make new blog sites by using your other domains and start active blogging by sending links to your .com site

First of all as soon as you get your report,try to fix all errors mentioned asap and then move forward