When I was in college, one of my company instructors told us students that one of the greatest hurdles to making money was procrastination.
Cloning your site is another degree in fix wordpress malware virus which can be very useful. Cloning simply means that you've backed up your site to a completely different location, (offline, as in a folder, in order not to have SEO issues ) where you can access it in a moment's notice if the need arises.
I protect an access to important files on the site's server by placing an index.html file in the particular directory, which hides the files out of public view.
Before you can delete the default admin account, you need to create a user with administrator rights. To do this go to your WordPress Dashboard and click on User -> Create New User. Enter all the information you look at here will need to enter.
You could even get an SSL Encyption Security for your WordPress blogs. The SSL Security makes secure and encrypted communications with your blog. So that all transactions are listed, you may keep history of communication and the all the cookies. Be certain all your sites get SSL security for utmost protection.
Don't use wp_. That default is being eliminated by web hosting providers but if yours doesn't, adjust wp_ to anything but that.