Migrating Pure PHP Site with Associated Database To New Server

First, let me say I'm not a DBA or network admin, but have moved large scale CMS websites from host to host. But, I have never moved a pure PHP-coded database driven website from one host to another. What I have done is moved the entire site including the level above 'html' with the include folder with config.php, database.php, main.php etc. I have imported database(s) and have proper credentials for access. But, when I try to load a file from the site (ex. accounts/index.html) I just get partial code returned with no css styles or anything that controls the site. Could someone point me in a direction to be able to start to sync this site back? Like I said, getting raw output with viewing files and can't even get CSS to load site colours and styles. I'm a newb when it comes to this aspect of things and appreciate any guidance.