Install the secure your wordpress site Firewall Plugin. This plugin investigates requests to recognize and stop attacks that are most obvious.
There are ways to pull this off, and a lot involve re-establishing more and databases and FTPing files, exporting and copying. Some of them are very complicated, so it's imperative that you select the one that is right. Then you may want to look into using a plugin for WordPress backups if you are not of the technical persuasion.
Keeping your WordPress site up-to-date is one of the easiest things you can do. For the past couple of versions, the ability to install automatic updates has been included by WordPress. A new update becomes available.
BACK UP your website and keep a copy on your own computer and off-site storage. If you have a very active site, back. You spend a lot of time and money on your site, do not skip this! The one complete solution that does it all is BackupBuddy, no back up plugins, widgets, your files and database. Need to move your site to another server, this will do it!
Do your homework and some searching, but if you're pressed for time and need to get this try the WordPress basics safety plugin that I use. It is a relief to know that my site (and business!) are secure.