Setting up your own email signature is not a strenuous task for a single user (please see how to create or modify an email signature in Outlook 2010 and 2013). However, the perplexities may build up if you aim to set up several individual signatures for various email addresses you operate on in the same Outlook client.
In Outlook 2013 the easiest way is through adding a specifically edited signature for each user in File > Options > Mail and then, Signatures…