First log onto ssh via putty.
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1. Upgrade & Update your Server
apt-get update
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apt-get upgrade
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2. Install VNC now
sudo apt-get install xorg lxde-core tightvncserver
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5. Enable VNC
vncserver
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6. After finishing the process you will be prompt to enter a password. To change the password type vncpasswd in ssh.
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6. To login to the server from a vnc client you have to download a vnc client, I recommend realVNC.
https://www.realvnc.com/download/viewer/
6. After installing enter your ip and the port as 5901 to login
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Replace xxx with your IP Address