Ikea is the simplest answer to furnish your place with new stuff, Tree is a local brand that seems well regarded but pricey, many expats come and go (more going as of late I'd imagine) and sell quite good 2nd hand furniture for fair prices and if you find someone selling all their stuff you can strike a deal and hire some local movers. Pricerite is a local chain with most of the basics, JHC (Japan Home Center) will get you most of the small appliances and such, Franc Franc for dishes, towels, and some furnishings.
Keep in mind when you walk into a store here it's not like Canada (or even other Asian countries) where you can pick out everything and have it delivered by the next day, especially when it comes to things like queen sized beds. It might be 1-2+ weeks for some things to be available.
As others on this forum will likely suggest you should get a serviced apartment for a month or two and get a feel for the different areas in HK, the atmosphere varies wildly. Personally I don't care for Tung Chung, it's a big bunch of high rises and a mall, although it is close to nice hiking and the Lantau Country Park. Tung Chung has also been one of the flash points during the crisis the last few months.
You should look at Discovery Bay, I hear a lot of people who work at the airport live there and it's also only 30mins boat ride to downtown and has been isolated from the recent unrest. Prices for flats of 600+sqft will be $16,000 (a real bargain) bit likely start around $20,000 for a decent sized 2brm.
Given the current crisis unless your employer is covering the cost with a settlement package you may not want to invest too much in furnishing your place only to find HK isn't a place where you want to stay.