Migrating from Non WordPress site to WordPress site

I’ve got myself a but confused and need some help. I’ve got a site e.g. [email protected] and I have created a new WordPress site on [email protected]. What I need to do is not only maintain the SEO for [email protected] but also re-direct the urls to [email protected] AND the url ‘appear’ like it is [email protected]. I’ve got the re-direct working (using .htaccess) but do not know how to make [email protected] appear as [email protected]? Any suggestions? or am I trying to do something unachievable?