What you need is a Facebook Business Page. This is going to be the foundation of your Facebook marketing. It's going to allow you to draw in more of your target audience by sharing your knowledge and enthusiasm and still keep your friends.
Here's a great video that will give you basic instruction.
For direct sales professionals or consultants, I recommend using your own branding and not your company name. For example, if your name is John and you sell widgets for Tommy's Tools and Widgets, do not name your page Tommy's Tools and Widgets. Instead, consider something like John's Handy Household Tips or John's Toolbox, something relevant to the business you are in, but uniquely identifying you.
Once you have your business page set up, you should share tips, tricks and other information that your target audience will find interesting. Make a few posts there and then invite your friends. Those who like what they see, will click Like to join and continue getting your business updates. Be sure to check out my Facebook Business Page and click Like if you like what you see!
I'll go further into what to share and how to do it without spamming in an upcoming post. Be sure to subscribe to this blog to get all the newest updates as soon as they are available.