The fix hacked wordpress site Codex has an outline of what permissions are acceptable. File and directory permissions can be changed either via an FTP client or within the administrative page from your web host.
Everything you have worked for will proceed with this should the server of your site go down. You will make no sales, get signups or no traffic to your website, until you get the site back up 32, and in short, you're out of business.
Keep your WordPress Installation up to date - One check my blog of the simplest and most valuable tasks you can do yourself is to ensure that your WordPress installation is updated. WordPress provides you a notice on your dashboard, so there's really no reason not to do this.
Another step to take to make WordPress secure is to always upgrade WordPress to the latest version. The reason for this is that with each upgrade there also come fixes for security holes that are old which makes it essential to update early.
Implementing all the above will probably take less than an hour to finish, while making your WordPress site much more resistant to intrusions. Sites were last year, largely due to preventable safety gaps. Have yourself prepared and you are likely to be on the safe side.