I live in Hong Kong and have an annual pass, so here are my thoughts.
Coming from the airport to Disney, your best option is to take a blue Lantau taxi. Taxis are cash only, and I’m guessing it’ll be about $150 HKD. You can take the airport express train to Tsing Yi, transfer to the Tung Chung line one stop to Sunny Bay, and then transfer to the
Disneyland resort line, but it will take much longer, and you probably won’t save any money, especially if there is more than one person with you. That being said, if you go anywhere else in Hong Kong, public transit is the way to go. You can buy an octopus card at any MTR station. It’s an add value card used to pay for the mtr, busses, ferries, and you can also use it at almost every store and restaurant in Hong Kong, including at HK Disneyland. If you plan on exploring the city, I recommend downloading the CityMapper app. It will tell you the best route from your location to your destination, using trains, busses, ferries, trams, or a combination of the above.
As far as fast passes, the only one I ever get is for Winnie the Pooh. Especially if you are going to the park on a Monday, the waits for space mountain and iron man probably won’t be longer than 10 minutes. Sometimes Winnie the Pooh can be 30-45 minutes. I’d start with a winnie the Pooh fastpass, and then move on to get an iron man one if you aren’t happy with the wait times listed. The wait times are usually accurate, in my opinion, although sometimes the wait times listed at the ride and on the app can be 5 minutes different.
I find the food to be lacking, but I find Explorer’s Club or Royal Banquet Hall to have decent options. Those are the only two restaurants I will eat at in the park. The walk up window in Grizzly Gulch is also decent and a good deal in my opinion-they sell fish and chips, chicken nuggets, and salads, and nothing on the menu is more than $50 HKD.
The park is very small, and it is easy to get from one place to another. I’d recommend getting a fast pass at Pooh, and then heading to Toy story land to do those rides if you are interested in those (I don’t ride them due to motion sickness). The Toy Story rides tend to have some of the longest waits, so ride them early if you can. After that, I would just base what you ride on showtimes. I love the lion king show, and I won’t go to the park without seeing it. The Mickey and the Wonderous Book is ok, but I don’t like it as much as the Lion King. The Mickey show is mostly in Cantonese, with subtitles. Try to sit on the right hand side of the theater so you can read the English subtitles easier.