I need help! Substrings

So i signed up for my last compscience class so i can graduate... the class i
needed was canceled so i was put into a more difficult class for majors. 
Comp science is my minor... anyways, I am currently doing twice the work i
would normally do in half the time.  I am lost.  if anyone can help me, i
would appreciate it SOOO much.

I need to write a function SubString : string * string -> int that checks
whether the first string is a substring of the second (case sensitive). 
return the index position (starting from 0) if the string is a substring or
-1 otherwise.  for multiple occurances, just return the index of the first
appearance.  you may assume both input parameters are strings.

subString("ab","abcdefg")=> 1
subString("aaa","aaaa")=>0
subString("bc","absge") =>-1
subString("ab","cdabd") => 2
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