Further assistance installing Drupal with access to one existing database.

First off thanks in advance for the help, and I look forward to getting this up and running.

I like others, am limited to one database with my hosting.
No problem right? I found this document : http://drupal.org/node/2622
Perfect, done tables now have dr1_ prefix.

Now the next step I am sure is simple, but I am stumped on.

"create tables (using phpmyadmin, go to database -> SQL -> load database.mysql file which comes with drupal in /database/ directory)"

Is loading this file into my database going to destroy the 30 other odd items I have installed? Is there a better way to install the required database files? IF this is the best way where do you load the database file into?

All I see under 'SQL' in phpmyadmin 2.6.1 is…

Run SQL query/queries on database
or
Location of the textfile: [I am guessing use this to upload the needed documents into the database]

Thanks again for the help