Hi and welcome, i can answer some of your questions:
1) printer manual will be available soon.
2) it will be in English and i believe other versions
3)amazon already sells the game Cant say who will be selling the manual
A) TrackIR will fit any baseball cap if you buy the Pro version you get the Baseball Vector clip and the headphone Pro version that has a clip that fits any headphones
B) the X52Pro will work out of the box if you asighn the keys using the SST software and set up your axis points
A) specs wise here is the minimal secs required to run BS:OS: Windows XP, Vista; CPU: 2 GHz; RAM: 1 GB; Graphics: 256 MB ATI or nVidia, DirectX 9 compatible; Sound card; 4 GB of free space on HDD; Copy protected, requires internet activation.
You will require a USB hub of some sort if you do not have enough ports for TrackIR, rudders and X52Pro on your current pc. Mine plugs in my pc.