Hey guys!
Anyone out there that has set up their own business or planning to? Because I really need some advice about the social media networking side of it and I'm hoping this is the place where I can get it

I've recently set up my own business (it's a T-shirt printing business, and I hear ya, there are a lot out there, right?) but I really do want to make it a success as it's something I've been thinking about doing for a long time and I don't want to see it fail. So, I've done some research on ways to promote the business and the obvious one is social media networking but apart from having a personal Facebook account, I don't know much about using Facebook or Twitter for business. I found this when I was doing the research
http://www.icontact.com/resources/social-media-marketing-guide and was wondering if anyone knows anything about them? What do you think I need set up to build up the number of customers for my business: Facebook, Twitter, LinkedIn? If you have any experience in this area, please share any info

Your advice will be really helpful! Thanks!