Should i start a blog in realation to my main website,that way i can let people now about my site and perhaps direct people to my main site.
Do many people use there blog as a platform to there main site?

Do you feel one is necessary?

Also which site are you thinking about making it for? The one in your sig?

Putting out relevant and helpful content about your business on the Internet will definitely helps to generate traffic to your business page. Thus, a blog is not a must but will be a great addition.

Apart from that, you can always update your visitors or subscribers about the recent happenings in your industry and how your business will react to that. This will help to build trust as well.

Putting out relevant and helpful content about your business on the Internet will definitely helps to generate traffic to your business page.

Yes Absolutely!

BUT it doesn't need to be a "blog"

there are NO MAGICAL PROPERTIES about a "blog", any method of delivering the content to the Internet will suffice. What counts is that you get the information "out there", the platform is merely a means to an end.