orchid leaves dropped and leaves turning yellow

[Johnny51]

Hi Everybody!

I am excited to join this forum! I have two orchids that are not doing well. One was a gift planted in soil so I transplanted it in orchid bark which it did well for over a year but never bloomed. I water it once a week in the soil and fertilize every two/three weeks but last week, the three really green leaves it had fell off BUT it has finally has little buds that are growing out. So will new leaves grow if I stop overwatering it(I guess that's the problem) and does an orchid need leaves to bloom? Also another older orchid (4 yrs) recently lost two leaves that turned yellow...over watering again? Your help is greatly appreciated!!!
Johnny