About the genus:
Hoyas are commonly known as “wax plants” or “porcelain flowers”, and are beloved by many indoor plant collectors for their wide variety of foliage and waxy, fragrant blooms. Most are native to several countries of Asia and Australia, with the greatest diversity of hoya coming out of subtropical and tropical Asia through the western Pacific. There are about 500 species of Hoya identified so far, with an estimated 600-700 hoya more that are still undescribed or unnamed.
Hoya plants will not respond well to too much moisture for extended periods of time and instead prefer a well draining mix with orchid bark, tree fern, sphagnum moss, perlite, coco husk, or leca. Whatever mix you go with, ensure it gives the roots plenty of oxygen while still holding some moisture. A chunky mix of coco coir, earthworm castings or peat moss, perlite, and orchid bark) works great.
Let soil dry between waterings. Your Hoya will definitely appreciate bottom watering (add about 1-2 inches of water to the saucer or tray beneath the pot).
Most hoya plants prefer medium to bright, indirect light. Some can tolerate moderate amounts of direct light either in or near an east or north facing window that gets softer morning light.