Online Website Security

I have few website and ecommerce store hosted on blue host.
I would like to be safe from any hacking or bad activities done on any of the websites like:

How would i know if someone trying to do some harm or hacking codes on my website.
Who is currently viewing my website their location and their activity log.
How many online active visitors are currently viewing my website.
Also protecting the website mail address from getting spammed.

Something related to this is provided by the host provider itself.
Or shall i have to get software or such services from others?