Before you can get started building your Facebook business page you will need to first have set up a Facebook personal page.
First up visit Facebook and (click here) create an account

Once you have this set up you will need to create your business page. This remains separate from your personal page.
To do this select the tab create (see image below) then click on Page

You will then be prompted to add your business details, location, contact number etc. You will need to take care in selecting your job category, service areas and uploading formatted images.

If you need more help with this click through to my business page

Once you have your business page set up you can post images of your work, promote your product/services and circulate this with your online friends.
There is also an option to run promotions by creating a small advertisement select a target audience and length of campaign needed.