You should preferably include all forms: one as the headword (identified by the first parameter), the others by the named parameters.
The first parameter is the form of the headword (pagename):
tsboth traditional and simplified (for when the two forms are identical)
Other parameters are:
tra=traditional form (optional, required when entry is in simplified form)
sim=simplified form (optional, required when entry is in traditional form)
pin=Pinyin (required when entry is not pinyin)
pint=Pinyin with tone numbers (e.g. ci2dian3); used for category indexing
mw=The associated classifier (also known as measure word or counter), e.g., for five dictionaries one writes 五本字典 (the measure word is 本) so the entry for 字典 includes
rs=radical/additional strokes for category indexing, e.g.
rs=斤09for 新 and
rs=手04for 扳, stroke count must be 2 digits (required if not
Note: there is no parameter for Wade-Giles romanization.