Do I just repot this or divide it as well?

[Nelly4]

Hi - I'm very new on here but I'm learning so much about my little collection of orchids.

Anyway, I purchased a hanging dendrobium orchid from an Orchid show several years ago and it was gorgeous purple/pink flowers all over it. Since then, there has been a fair bit of growth to it and I took the hanging wires off it to just grow in the pot and it hasn't flowered since then (about 4 years ago!)

Anyway, I've just learnt (on the beginners discussion) that its should be repotted but as its so crowded in the little pot, should I divide it too and into how many plants?

How big should the new pots be?

Should the medium be course like bark?

Ooh, sorry so many questions.

I have posted some pictures and the one I'm talking about is the small one that has grown in a little ball shape.

Any advice would be greatly appreciated. Thank you!