Seeking help on how to sell my service

Hello, and thank you for your time. I am just curious as to which is the best option to sell a script installation service.

Option 1: Offer nothing but a "Free quote request" form. Then I get back to them

Option 2: Offer a few scripts they can learn about and download, and offer a fixed price to install them. If their script is not listed, they would request a quote.

Option 3: Simply offer a set price to order immediately depending on what type of script they have. (Based on complexity, php or perl, etc..)

Which option would you recommend? And do you think it is best to take their server technical details before or after the order? As it would require 2 forms.

Thank you for your time