Rakstar, these are steps.
1. In your office goto
DynDNS.com: Free DNS Hosting, E-mail Delivery, and VPS Hosting
2. Chose free dynamic dns
3. Create a hostname (ex. rackstar.dyndns.org) then click add, in this way your hostname point your dynamic ip address. Continue to create your account.
4. Take note you dynamic ip address using
What's My IP Address? Your IP is 216.34.250.1
5. Now ping your hostname and observed, if pointing your dynamic ip.
6. Now download and install dyndns client updater. this will automatically update your hostname by the time
your dynamic ip address changes.
7. Now, in your home open RDP. Type the hostname you created and click connect. this time you can login your server using your valid account and password.