Ok, so I have a few mods like creature x and creatures and it says I need to merge list or something in the readme..Are there any tutorials for this and do you need any mods? Thank you

The best tool for creating a Merged Leveled List is http://www.tesnexus.com/downloads/file.php?id=27588.
The http://wryemusings.com/Wrye%20Mash.html has all the info you'll need to use that program, including a section on how to create the Merged Leveled Lists.

If you don't know what leveled lists are, and why they need to be merged, http://www.mwmythicmods.com/starting.htm#lists