Hoyas are not difficult to grow but maybe a bit fussy about blooming. The trick is to leave the "spur" or stem that bears the flowers intact after bloom time. New flowers will arise from the same place. Often this is pruned back and then the plant takes a long time to get to flowering stage again. Keep the plant in a sunny or semisunny spot in the house with good light and average temperatures. Mist it daily to create a more humid atmosphere or stand the plant on a water-filled tray of pebbles. Keep the soil a bit dry in the fall and winter, below 70° while it rests but increase water and fertilize come spring as days lengthen and temperatures rise. If your plant is seriously pot bound, I would repot it into the same pot with humus-rich potting soil in the early spring.