2) I won't give you a solution. If I do, you won't learn how to code. muhwahwahwa. :insert evil laugh smiley here:
3) Here's the pseudo code:
Do the parseInt stuff also, I left that out... (like type-checking stuff).
numArray = create a new array with size of 5;
a for loop from i = 0 to i < 5, stepsize 1.
prompt user for a value, and insert it into i-th index of the numArray.
minNum is 0-th element of numArray.
a for loop from i = 1 to i < 5, stepsize 1.
if the i-th element is less than minNum, replace minNum with this i-th element.
//please do max on your own. (left to reader as an exercise. haha)
And man, don't give up too soon. It's way too soon to give up! You gotta try harder man...