The following is a short list of recommended plugins for your WordPress installation:
Add Descendants As Submenu Items – Handy for menu creation
Limit Login Attempts – can help prevent brute force attempts to take control of your wordpress installation
BackUpWordPress – makes scheduled or on demand backups, easy to configure and use
Duplicator – The easiest way to move your entire WP installation to a new server
Akismet – Protects your blog from comment & trackback spam, comes bundled with WordPress
Contact Form 7 – easy to configure and use contact form plugin