Security plugins can be purchased by you . There are security plugins out there that promises security for your own blog. One is known as secure your wordpress site Scan. The system is continuously scanned by this plugin . It also updates the security that the system these details can not be penetrated by new hackers.
The approach, and the one I recommend, is to use one of the password generation and storage plugins available on your browser. RoboForm is liked by people, but I believe after a trial period, you have to pay for it. I use the free version of Lastpass, and I recommend it for those who use Firefox or Internet Explorer. Your Domain Name That will generate passwords for you.
You must create a user, before you can delete the default admin account. To do this go to your WordPress Dashboard and click on User -> Create New User. Then enter all of the information you need to enter.
If you're not running the latest version of WordPress, upgrade. Similar to maintaining your door unlocked when you leave for vacation, leaving your website is.
Of course you can set up plugins to make your store more user friendly like automatic backup plugin or share buttons. That's all. Your store is now up and running!