heres a few things to take into consideration before you start:
your cars resonant frequency - the frequency your car peaks at using a tone and a sealed box

available space - how large of a box can you fit

sub - this will determine box requirements ie: net volume, port area

amp/s - a sub becomes more efficient in a larger box, so the more power you add to a sub, the smaller the box will have to be.

If you need anything explained further let me know and I can go into more detail.

Sina, I have very little experience building one note wonder boxes, but its basicly the same as any other box with ALOT more planning and modeling involved. Then of course, the 8-10 boxes used for testing.