The first step is to enable SHARING in the computer you want to access remotely. Instructions to Follow on Computer(s) you Want to Control
If you have MacOSX 10.14(Mojave) or MacOSX 10.15(Catalina), If you have MacOSX 10.14(Mojave) or MacOSX 10.15(Catalina), read the instructions on the changes you'll need to make to your computer during the installation of the VNC Server in your office Computer and/or the VNC Client in your home computer.