Look at your online form as if it were the first time you had ever seen it. Check the following:
- Is the requested information is in a logical order?
- Is the same information being requested twice?
(This is a problem for businesses using third party services - such a PayPal.) - Are you asking for unnecessary information?
(If you have the postal code -- you don't need to ask for the city or province.) - Do you automatically format the input or do you force the customer to use your format?
(People enter phone numbers in many different ways.) - Do you validate the fields before the customer submits the form?
(Yes, fields CAN be validated before the form is submitted.)
Once you have those problems fixed - look at the page layout. Like the disheveled sales person a cluttered form will drive customers away. If necessary beak the form up into a number of pages.
Making your online form a 'good closer' is all about making things easier for you customers. It may take some time - but the results are worth it.