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Hhhhmmnnn ......
"Drop" usually refers to a 2-semi-tone drop, usually "drop D".
Sooooo ..... *hopefully* ..... "Drop B" *might* mean a similar
drop ..... just 1 or 2 semi-tones from CFBbEb or from C#F#BE.
The above is reasonably do-able. The low string is a normal
B-string. The FBbEb is the rest of the BEAD set cranked up
one semi-tone, which is a minor tension increase. Or you can
use the normally "ADG" strings for either FBbEb or F#BE. The
tension on those three will be slightly reduced but very good.
I play CFBbEb at times, using a normal EADG set, and the one
string that *could* stand some improvement is the E tuned to
C, but you will be using a B-string there.
Acoarst if the OP is actually about a drastic downtuning PLUS
a drop on the low string then there's no "best way" to execute
a really hopeless idea :-(
You're new to bass so be advised that while a geetar can be
slack tuned cuz there's a bit of tension to spare. This is not
so [or, at best, barely so] with bass geetars. A *proper* bass
has a 42" scale, so a 34" scale bass geetar is already quite
compromised and so barely an OK candidate for downtuning.
Whereas a tenor geetar is at it's "native" scale length, thus it
is not "pre-downtuned" at EADGBE and so has decent margin
available for slacker tuning. Technically, even a 42" scale bass
is shorter than it should ideally be [calculating from the violin
as a base line], so slacking a 34" bass more than very slightly
is pretty much a losing proposition.