There's been a lot of threads in this forum from people asking the same/similar questions that you are. Here's a few for you to look at:
http://www.techsupportforum.com/conv...-business.html
http://www.techsupportforum.com/conv...-business.html
http://www.techsupportforum.com/conv...-business.html
There's many more, just do a search in The Tech Business forum. There have been a lot of good ideas and suggestions already.