Where do I get a mod installer?

[SSJVegetaTrunks]

Where can I find an "installer" to be included in my mod once it's finished?

[Makanyane]

Try this - there is a free version and it is relatively easy to set up:
http://www.clickteam.com/eng/installcreator.php

also look at Dol Guldur's thread here
https://forums.totalwar.org/vb/showthread.php?t=78406
about making a .bat file to help install operations (if you need to copy or delete existing folders as well)