>> Combine the two functions (human/computer)
IMO that's a bad idea, unless you meant to move the two function calls to a separate function, which couldn't hurt but isn't necessary.
>> I couldn't figure out how to get the returned values from the first two functions...
Your code already does it, you store the values in the comp and user variables. You can just pass those variables to the printResults function (of course, you have to modify printResults to take two characters, one for the user answer and one for the computer answer.
