In Hong Kong for 6 weeks

Will be in HK for six weeks working on the island. A few questions:

What are good apps to get
what should be on my bucket list
can i get by with mainly english
what should my budget be for cost of living
is there another way to find an apartment for only 6 weeks that isnt airbnb
which areas are safe and not safe
how much is a SIM card for 6 weeks (around 5GB of data)