I use a skateboard, cruiser & longboard depending on the situation.
I'm guessing you'll be using one just for travel & not tricks?
If so & if you're buying the parts separately get softer wheels like 75A-85A durometer.
They'll absorb more vibrations, grip the ground better & have a smoother ride overall.
Bones Redz bearings are a fast & affordable choice.
Board size/shape & truck width is up to you really.
The Crailtap Couch Cruiser is a great pre built one, smaller trucks & board so it's fairly light compared to regular boards.
Not sure how the options are in China tho

Just don't get a lame Penny board

)