Sign writers can create signage for your business. They can help it stand out to potential passing customers.
Signage is very important to help the customer find your business. Often people don't even realise that a business exists if it doesn't have adequate signage.
Yes, there are usually council rules on the height and size of a sign. Imagine if you have a sign so large it was blocking the planes flight path!
Yes, most signwriter's can help you with the design of your signage as well as the implementation of the signage.