For cuttings, use a 2 inch pot (or 4 inch for 2 cuttings). I use the exact medium I plant in to root in, which is 70% orchid bark (1/4 inch), 20% perlite (I use 1/4 inch perlite) and 10% organic potting soil with NO added fertilizer. Just place the cutting in the medium, keep it moist and humid ( I use a large clear rubbermaid and put saran wrap over the top) and provide bottom heat (optional). Every couple of days, remove the saran wrap and air the plants out. My setup:

I have Hoya Bella and started it from cuttings. I just stuck them in some plain water and set in the window. They all rooted just fine. I then put them in soil once they had plenty of roots with no issue. Best of luck!