Moshe is instructed to take a tally of all the family of Gershon (one of the families of Levites) between the ages of 30 and 50, who are able to work in the Mishkan. Their task in the desert is to carry all of the tapestries and hangings that cover and surround the Mishkan. The males between 30 and 50 of the family of Merari (another Levitical family) are to be counted. Their task in the desert is to carry all of the beams and pillars, along with the pegs and bases with which they fit together.
G-d instructs Moshe to send anyone who is impure out of the inner camp of the Mishkan. The Torah then lists the procedure for the Asham (guilt sacrifice) which is brought for a false oath about a deposit left for safekeeping.
The Torah lists the laws of the Sotah (suspected adulteress). She and her husband who accuses her must come to the Temple bringing a sacrifice. She is to drink specially prepared water. If she has committed adultery she will die within the year, but if she is innocent she will be rewarded by becoming pregnant within the year.
The laws of the Nazir are listed. When a man or woman chooses to become a Nazir they are prohibited to drink any grape products, cut their hair, or to come into contact with the dead. This is for the duration of their Nazirut (usually 30 days). Upon completion of their Nazirut they must shave off all their hair, and offer it on the altar along with a sacrifice.
G-d told Moshe to speak to Aaron and instruct him how to give the Priestly blessing. The Cohanim shall be a conduit through which G-d's blessings will rest upon the people.
When the Mishkan was erected the Princes of each tribe brought sacrifices, one each day for the first twelve days. They also donated the silver and gold containers in which they brought their flour and oil offerings.
From this point onwards, G-d would communicate with Moshe from between the two cherubs on the cover of the Ark of the Covenant.