Future bass uses a lot of major7/major 9 and minor 7/minor 9 chords so that would be a good place to start with those extended chords.
Sound design wise the chords are usually just saw and square waves with an lfo or some other form of automation on their volume and or cutoff. Depends what style of future bass your going for but it's usually good to layer your chords to help achieve a fuller sound, with the higher layer being more stereo wide and mixing in some white noise to fill the top end.
As for arrangement I would recommend listening to some tunes you like and taking note where each section changes and how long each part is.
Hope that helps, I have been starting to give it a shot myself so let me know if you need any further tips.