1)
What does "va'Yafkidehu Al Beiso" entail?
1.
Malbim: Yosef oversaw the expenditures.
2.
Ha'amek Davar: Yosef was appointed over those who served in his house and over his property.
2)
What does "v'Chol Yesh Lo Nasan b'Yado" include?
1.
Malbim: Normally, one person oversees income, and another, expenditures, due to concern for theft. Potifar appointed Yosef over both expenditures (Beiso) and income and storehouses (v'Chol Yesh Lo). 1
2.
Ha'amek Davar: It is service of the king incumbent on Potifar, his authority and honor.
1
The Malbim (to 39:8) explains Yosef's words similarly.