Checking CM????

Anita • I`m 22 & have been TTC for 7 mon. now unfortunately I have irregular periods. I`ve been in a great and loving relationship with great partner for 5 years.
So I'm a little new to all of this stuff and I was wondering how you go about checking your CM? How do you know what is what? I've been reading that checking it is good for predicting when you are ovulating. And I would really like to start tracking it. Any help would be awesome ladies :)