I am looking for advice on the steps to take to re-structure my website. We currently have an osCommerce based site in the root of the site (i.e. mysite.com/index.php).
Our plan is to have a CMS based site as the main site (at mysite.com), and have a new e-commerce site as a sub-domain (store.mysite.com).
The existing osCommerce site is well ranked in Google, Bing & Yahoo, and we'd dearly love to retain as much SE ranking goodness during and after the changes.
I had thought the steps would be to 1) move the current site to a sub-domain, 2) place the new CMS based site in the root, and 3) when that lot has "settled in", replace the e-commerce site with a new version.
Does this sound about right? If so, what's the best strategy on implementing wholesale redirects from mysite.com to store.mysite.com in the first step? (We have about 70-80 pages on the site including product pages).
I would very much appreciate any help or advice before I embark on this onerous task.
Edit: We're replacing the old osCommerce site because it is out of date, heavily modified and the design is old and needs replacing. The company has more services that it offers now, so a CMS would suit our website better, but still with a more modern e-commerce site.