First off, check weather your Laptop has a VGA or DVI port, mine was VGA and most of the Laptop manufactured these days have VGA ports only.
Difference Between VGA and DMI Port
The Image shows the difference.
Also, shows how the Cables look like.
As VGA is more common you will be getting a Monitor with a VGA output and will be getting a VGA cable as well.
Now find the VGA/DVI Output on the Laptop and connect one end of the Cable to the monitor and the other end to the Laptop. Your Laptop will automatically detect the external monitor and will ask you weather you want to make it an external display or duplicate the monitor of your laptop.
You can also go to the settings by doing a right click on the Desktop and select the Screen resolution.
A Window will appear where you can click Detect to find which one is your primary and which one you have added just now. Then from the Multiple displays option, you can select Extend these displays option.
You can also set the positioning of your external monitor. For example, if you have kept your external monitor to the left hand side of your Laptop, you can drag it to the left and apply the settings.
You can also set the positioning of your external monitor. For example, if you have kept your external monitor to the left hand side of your Laptop, you can drag it to the left and apply the settings.
