What's the difference then between liten/lilla and små?

I might have asked this elsewhere at some point, but does Swedish have a specific order for adjectives? There's a reasonably famous quote about how, in English, adjectives:

"...absolutely have to be in this order: opinion-size-age-shape-colour-origin-material-purpose Noun. So you can have a lovely little old rectangular green French silver whittling knife. But if you mess with that order in the slightest you’ll sound like a maniac." - Mark Forsyth

If this was going be in the definite form, would it be "Den små röda äpplet?"

So lille, litet, lilla, små? Examples where we use this please?

Almost sounds like 'A little tired apple'

Hm, how would you know that it is "one little red apple" rather than "a little red apple"?

So it is en liten... or ett litet... , But lille is used for both en and ett words?