Here is what you will need...
* A domain name (godaddy.com)
* A webhost (totalchoicehosting.com)
* Either a pre-existing script that will do what you want it to do (http://hotscripts.com/PHP/Scripts_and_Programs/Classified_Ads/index.html), or I suggest you hire someone professional for that part.
To be successful, you need an easy to remember website name (domain), a webhost that allows you to expand shoudl business/traffic increase, and a website that works. You may want to find someone with a little but of web experience to partner up with, should you go with the pre-existing script (which would be much cheaper), but if you hire someone, they can design the script how you want, and make it customizable for you with or without much web experience.
I've given you some websites to look.
Let us know how it goes.
I am thinking of setting up a website were users would pay to post classified ads related to a specific industry. I have no experience of web design and have never created a website before.
Can anyone recommend a software package that I could use to do this or should I hire a professional company to do this for me?
Please let me know your thoughts,