Shulchan Aruch Chapter 250:
The Laws of the Shabbat Meal (2 Paragraphs)
Note:  REMA in brackets [ ]

1.  One should wake up in the morning to prepare for the needs of the Sabbath.  Even if one has many servants that serve him he should still strive to personally prepare any item for the needs of the Shabbat in order to honor it.  Rav Chis'dah used to cut the vegetables very finely, Ruvah and Rav Yosef used to chop wood, Rav Zeira used to kindle the fire, Rav Nachman used to prepare the house, prepare utensils for the needs of the Shabat and put aside the regular utensils, and every individual should learn from their example.  One should not say "I will not go below my honor", for it is indeed within one's dignity to honor the Shabbat.  [There are those who sharpen a knife on Erev Shabbat since it is considered for the honor of the Shabbat as it is used to prepare the food.]

2.  One should prepare a lot of meat, wine and treats in accordance to one's resources. 

Shulchan Aruch Chapter 251:
To Not Do Work on Erev Shabbat from the Time of Mincha and Onward (2 Paragraphs)
Note:  REMA in brackets [ ]

1.  One who performs work on Erev Shabbat from the time of mincha and onward will not see any good from it.  Some explain this refers to mincha g'dolah [1] and some say it is mincha k'tanah [2].  [This is only when one performs the work as an established practice, but if one does the work as a temporary thing according to the hour, but nothing set, then it is allowed.  For example, it is permitted to write a complete letter and also similar type of things.]

2.  It is permitted to fix clothes and vessels for the needs of the Shabbat the entire day.  [The same applies to one's friend's clothes, but he may not charge for it.]  The same applies to one who writes religious texts for himself to utilize for personal study.  [However, it is prohibited to write for the use others for payment.  One may take a haircut all day long, even via a Jewish barber.  One should reduce slightly one's religious studies on Erev Shabbat in order that he should prepare for the needs of the Shabbat.]

1.  Lit:  "The great mincha" refers to six and a half daylight hours after sunrise.  The length in minutes of a daylight hour is the time in minutes from sunrise to sunset divided by 12. 
2.  Lit:  "The small mincha" refers to nine and a half daylight hours after sunrise.
Translated by Jay Dinovitser 12/2012