Jerry,
I have been exploring the BEST possible way for customers to input their listings to be posted to your site.
Option 1: A link to your e-mail address when they click "LISTINGS". They type the data and you will receive an e-mail which can be easily cut & pasted to your "Listings" page. (Least complicated)
Option 2: A data-based form (check it out by clicking HERE) This is a more sophisticated way of transmitting input data to you...but would require additional expense, additional training of your "typist", and higher maintenance to get where you want to get with your listings.
As always, I like to give my customers options.
Larry