Attempting to grow orchids again - repot or no?

[shams]

!

After a long hiatus, and a new house, I thought I would try growing orchids again. I currently have 7 phaleonosis NoIDs and a dendrobium NoID that the old owners left me, as well as I just got a Dendrobium Liberty White in bloom and an Oncidium Twinkle that is done blooming that I feel might need a repot.... but what's the best medium to repot it in?

When I tried this year's ago, I ended up with crinkled leaves, and the plant just didn'the do well. Currently I count 7 new growths on the outside of the plant.

Also....
I have no idea what to do with dendrobiums lol

Any help you could give would be great.

Thanks!