Reverse DNS is an address that is resolvable two ways.
resolves to 22.214.171.124
but to be reversible 126.96.36.199 would need to resolve to www.linuxquestions.org
, which it doesn't, but you get the picture.
If you are running a web-server off your hope ISP line, your IP address will already be reversible to a host set by your ISP. For example, "188.8.131.52" resolves to "s3.153.rb.gh.centurytel.net".
So say "184.108.40.206" is your IP address and you either set an a-record pointing to "www.test.com" with that IP or go through the trouble of nameservers and such. "www.test.com" may resolve through a DNS query to "220.127.116.11", but "18.104.22.168" would resolve to "s3.153.rb.gh.centurytel.net" the hostmask assigned by your ISP.
Nothing wrong with running it local off your home line, I do it, but we have no control over the DNS query reversibility of the IP set by your ISP, everything points to them, so there is no point in changing things. Simply set your IP as an A-Record in your domain control panel, the same can be done with the other sites you want to host on your local system. What you will need to look into are vhost, setting this up enables you to run multiple sites from the one IP address.