Go to your county web site and look at their online services.

Do some web searching and you'll find some. 

Typically you would use CRM software(web-based nowadays), youtube is full of videos with examples of how some people use and customize the software.

Most web host products are very similar these days, so you can't go wrong in most cases.

Got lots of options either wayFlip side...As the manager of Applebee's..... how do you think it will fly if I come up with a list of all the horrible patrons that come into my location and publish it to all the other restaurants in the area.

You can find him on the web.  

Additionally, many unscrupulous web sites are tapping into this need for a workaround to "pet rent", additional deposits, or a no pets policy, and are marketing to people that desire that. 

With only $400, the #1 thing you can do is listen to all 299+ BiggerPockets podcasts, and read every BiggerPockets Publishing book available in the market place. 

I have used up my 10 free rentals for the web site rentometer,  is there a 2nd web site that I can use for free to get rent amounts?

You can create a free web site or have it available to email anyone that asks.I also agree with @Nathan Schiess that you should always let people apply if they want.