I have some hoya cuttings and don't know how I should go about rooting them. I know that this is the wrong time of year to do this. But, more than half of my mother plant has died due to faulty watering and low humidity

and I decided to cut off some of the branches in order to rescue it. What is the best way to treat them? Do I have to wait until they form callouses and if so, how long? Do I put them in water, perlite, or potting mix?