Tersoth

I am at this point "Creating the Trinity databases in MySQL". Could someone please break this down a bit more then the guide shows for making the databases. I log into to HeidiSQL using root and password. Then what? I tried copying the 3.3.5 stuff in the link in the query tab and running it but that just gave an error that "world" already existed. Granted I have very very little knowledge and this sections starts using terms that were not used in the last sections. Thank you in advance for any help