What are the lines and spaces names of so-fa syllables?

Answer 1

It depends... The lines and spaces are used for musical notation which is pitch and key specific. Solfege (or sol-fa) is a more general system that does not directly apply to the notes on the staff. Solfege refers to notes from their position in the scale, but it is not key specific. Once you determine what key you want the piece to be in - then you could translate it into standard notation on a staff.

However, if you keep everything in C Major (the simplest key) then "Do" would be on middle C, one ledger line below the treble staff. It would also be in the second space from the top, one octave higher. From there every line, space, line, space movement up goes up through the solfege syllables: do, re, mi, fa, so, la, ti, do.