What is the appropriate Server for small Businesses or New?

It really depends on what your business needs are. Microsoft Small Business Server is probably one of your best bets. If software cost and licensing is a concern, you could use Open Source software packages such as ClearOS (free linux based server).

To take that a step further

You could buy off-lease or used PCs and load them with Linux Ubuntu (or any Linux Distrobution) as the desktop operating system. You would save a ton of money in software purchasing/licensing and antivirus, however you would need a knowledgeable administrator to set it up, plus some end user training.