I just need alittle bit more help

I've been trying to practice ska chords lately but I still am alittle confused. I found the Ska chords that this website gave in the "Regge" style section when you click on "home" but they are still realy confusing. I sat down today with my guitar, a small backstage amp, and my printed out sheet of the ska chords and I tried converting one of my easy songs into the ska chords. I've only been taught one scale and that was the C-major scale which is the whole step, whole step, half step, wholestep ordeal(in tab talk thats "e:3,5,7,8,10,12,14,15"). I tried playing C and then looking at the C in the ska chords chart but it doesn't really sound like it at all and when I want to play one of my notes, it is totally flip around.. Like the F chord is the lowest note instead of the C note or A note and the only C on there is a high C note. If someone has a tab of ska chord sheet that is not as confusing or could help explain this alittle more then I would most appreciate this.
:-=(Nekro)=-:
"the music I play is so fast, the rush gives old people an erection"- nekro

C doesn't have to be the lowest note in order for that chord to be based around it. It just has to be the root note if I'm not mistaken. To my knowledge, what makes a chord the chord it is, is the notes involved more so. Take a C major chord and replace the low C with an octave higher C, that would still technically be a C major chord because it's got the same notes and interval steps and all that crap. Disclaimer, don't hold me to this as I've never confirmed it, it's just based around my observations which could be wrong as I've never had any formal training. Sorry if I told you nothing that helps you. This just got on my mind.