Trig ratios, other trig mapping questions :/ Help greatly appreciated

Hey folks. Few questions here. A reply in detail ASAP = insanely appreciated. (Crying)

1. If sin a = y/r ; write the other 5 trigonometric ratios for a.

2. If csc B = -14/10 ; and B is in the fourth quadrant. Find the coordinate of the point on the end of the terminal arm, and its principle angle. Then find all the trigonometric ratios for B.

[t graph here]

(( I know it might be a challenge to find a graph but if you could upload one to imageshack or something or just explain it, It'd be great help ))

3. If (weird symbol, I think theta) * is third quadrant angle and cot * = -15/-8, find:

a) sin * cos *

b) cos^2 *

c) 4 cot *

d) cot * tan *

Once again thank you SO much for reading and helping! Need this for tommorow before I get behind!