If you have a facebook page for your business it is important that you personalise it as much as possible.
Make sure you fill in as many details as possible about your business, remember that with advanced search your business may be found via your facebook page rather than direct to your website.
It is important that your business facebook page has a professional look so you need to add a profile and a cover picture.
The best size for a profile picture is 200 x 200px but be aware that when showing your profile next to your status updates then this image is cropped so the best thing is to have an image 200 x 200px but leave free space around the actual image of 12px so the actual size will be 176 x 176px.
For the Cover Picture go for an image that is 851 x 315px – avoid trying to cram this image with lots of logos or information.