Primal/Dual Simplex methods clarification

Question

I have several questions regarding these methods.

Primal Simplex Method

1. Does the pivot element always have to be a positive entry in the table?
2. Does the RHS always have to be positive in the pivot row?
3. What if I have some negative RHS values?
4. How does the procedure differ if we are looking for MAX or MIN problem?

Dual Simplex Method

5. How do I select a pivot row? Do I select whatever negative value on the RHS or the biggest negative in absolute value?

6. Does the pivot element always have to be a negative entry in the table?

7. Is it allowed for the element in the row of Z to be both positive or negative, but not 0?

8. When performing the ratio test, do I only take care of what absolute value is the smallest?

9. How does the procedure differ if we are looking for MAX or MIN problem?

Example: Maximize w = -10y1 + 10y2 -15y3

 y1     y2     y3     s1     s2     s3     w     RHS
 -1     1      -1     1      0      0      0     -1
 -1     1      1      0      1      0      0     3
 1      -1     -1     0      0      0      0     -3
 -10    10     -15    0      0      0      1     0

Now, I assume I take a row with a RHS of -3 as a pivot row, but how do I choose a pivot column?

The ratios are: (-10/1 = -10); (10/-1 = -10); (-15/-1 = 15); which one do I use?