Migrating WordPress Site

Hi All,
I created a WordPress website Using a Template and some widgets. Now I want to Migrate it to another domain name.(As an Example Current Site is AAA.com and I want to Migrate to BBB.com).I don’t want to re install the Plugins and Theme and Editing the Codes.
So I searched on Google and Tried to Exporting Database form AAA.com site and Imported the database to BBB.com site. Now it’s Look like a Mess. All Elements gone wrong and I can’t Figure it out.If you guys know how to do it on a proper way Please let me know.