WordPress maintenance timeline
Every time you add content
Optimise your images
Never upload images that haven’t been properly prepared for the web ( 72dpi and as few kilobytes as you can with out dropping quality)
Backup your website every week.
Keep at lease 2 copies of previous backups
Scan for security
Update your plugins
Optimise your databse
Update our theme
Asses for any broken links
You might also be interested in reading this article about Website Maintenance
If this all sounds too overwhelming
Contact me for an obligation free quote on maintaining & managing your companies website.