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@chiroshi
40t sounds quite light, especially if your riding it freewhell, it kinda depends how much cyling you've done/how fit you are...
Most bikes will have a british 68 mm bb thread, but varying widths. You should be able to measure this with a ruler to the nearest mm. this is a good source of bb info (and all other worldy bike knowledge) http://www.sheldonbrown.com/gloss_bo-z.html#bottom
if you buy a standard road chainset, the chainline will most likely be straight(ish) if you use the placement for the middle ring. Not sure why chainsets had what bb they would match, pretty much all chainsets fit all bb's, unless you get some really old or obscure kit...
I'm sure your local bike shop will measure the bb, seat tube (usually 27.2, but can be different to the nearest .1mm)and steerer tube (if you dont have forks yet).
hope that helps a bit!