Hi! I have no gardening experience and am looking to grow a "fuller" looking rubber tree. I currently have 2 potted medium sized plants that I'd like to prune and propagate. I'd appreciate some tips on how to do so - techniques that are simple and apartment friendly. These plants are situated on an east facing window. I live in South East Asia, so temperatures year round are warm. Right now it's the beginning of summer and one of them have begun forming new leaves at the top.

The other one seems much more dormant with the top leaf sightly damaged.