Jumma Prayers -, There is no regular Sunnah prayer before Jumu’ah.

Is there any Sunnah prayer before or after Jumu'ah?
Praise be to Allaah. There is no regular Sunnah prayer before Jumu'ah
according to the more correct of the two scholarly opinions, but it
prescribed for the Muslim, when he comes to the mosque, to pray
whatever Allaah enables him to pray, saying salaam after each two
rak'ahs, because the Prophet (peace and blessings of Allaah be upon
him) said: "The prayers of the night and the day [i.e., other than the
obligatory prayers] are two by two." (Narrated by Imaam Ahmad and the
authors of Sunan with a hasan isnaad; the original is to be found in
al-Saheeh without any mention of the day.)
And many saheeh reports indicate that what is prescribed for the
Muslim when he comes to the mosque on Friday is to pray whatever
Allaah wills he should pray before the imaam comes out. The Prophet
(peace and blessings of Allaah be upon him) did not specify whether it
should be two or four ormore. All of that is good, but the minimum is
two rak'ahs to "greet the mosque."
With regard to after Jumu'ah, there is a regular Sunnah prayer, the
minimum of which istwo rak'ahs and the maximum is four, because the
Prophet (peace and blessings of Allaah be upon him) said, "Whoever
among you prays after Jumu'ah, let him pray four (rak'ahs)" (narrated
by Muslim, al-Jumu'ah, 8881). And he (peace and blessings of Allaah be
upon him) used to pray two rak'ahs after Jumu'ah in his house. May
Allaah help us all to do that which pleases Him.
Majmoo' Fataawa wa Maqaalaat Mutanawwi'ah li Samaahat al-Shaykh
al-'Allaamah 'Abd al-'Azeez ibn 'Abd-Allaah ibn Baaz (may Allaah have
mercy on him), part12, vol. 386