Hiya,
B minor has 2 sharps in the key sig, F sharp and C sharp. The Triad (tonic triad I think is what you are after - ie the one in which the bottom note of the triad is the keynote of the scale, B)..... would be B, D and F sharp, yes. I don't know what you mean by the C sharp = D thing, as C sharp would be the black note on the keyboard and D the white note on the keyboard, ie not the same note. (C
double sharp would be the same note on the keyboard as D). The Triad is made up of the keynote (B), a 3rd (D) and a 5th (F sharp), there isn't a C sharp in the triad as C sharp would be the
2nd note in the scale. (the scale of b minor contains both c sharp and D). Hope that helps and doesn't confuse matters.

ps for triads it's worth remembering that the notes 'sit' on top of each other, so they will either be all on the lines of the stave, or all in the gaps on the stave. If you used a C sharp instead of D in there then yes the spacing would be odd - you'd have two notes squashed together (line and space directly above it) and one note further away as it were.