When the Holy Temple stood in Jerusalem, each Jew contributed an annual half-shekel to the Temple. The 1st of Adar marked the beginning of the collection of the shekalim. In commemoration, the Torah reading of the Shabbat that falls on or before Adar 1 is supplemented with the verses (Exodus 30:11-16) that relate G-d's commandment to Moses regarding the first giving of the half-shekel.
"Parshat Shekalim" is the first of four special readings added during or immediately before the month of Adar (the other three being "Zachor", "Parah" and "Hachodesh")
Links: The Shekalim Reading with commentary; Partner; Tzedakah: Charity
This Shabbat is Shabbat Mevarchim (“the Shabbat that blesses" the new month): a special prayer is recited blessing the Rosh Chodesh ("Head of the Month") of the upcoming month of Adar II, which will take place on Sunday and Monday.
Prior to the blessing, we announce the precise time of the molad, the "birth" of the new moon. See molad times.
It is a Chabad custom to recite the entire book of Psalms before morning prayers, and to conduct farbrengens (chassidic gatherings) in the course of the Shabbat.
Links: Shabbat Mevarchim; Tehillim (the Book of Psalms); The Farbrengen
Start here: Open yourself to receive all that heaven wants to give you.
How will you receive it? By being empty.
Full of self-concern, of "what will become of me?" of "where life is taking me?"—there’s no room for life to enter.
But a simple, open spirit is filled with joy from heaven.