Do I need a previous partition for encryption of external drive

and how is it done ?

Without a partition in your external drive, you can't encrypt it. All drives come with at least one partition, so don't worry about it. If yours is not, you can create one with Disk Utility > http://pondini.org/OSX/DU1.html
Respecting to encrypt an external drive, you can do it through Disk Utility. It will give you the option to format it using a special "Mac OS Extended" encryptated format. You can also encrypt it by opening a Finder window, right-clicking it in the sidebar and pressing Encrypt

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