How do I use selectionSort algorithm to sort a string array alphabetically?

I have been trying to get a selection sort algorithm to sort a string array of 20 elements alphabetically. I keep getting type mismatch among other errors. I was successful in getting an integer array of 20 elements to work so I am wondering how to modify the integer algorithm to work with strings. Find below my code and if anyone could point me in the right direction, I would be thankful. Thanks!

Look at the datatype fo 'minValue', and all your temporary variables, That should be a hint.

I want to be sure I understand what you posted. Simply changing the data type of minValue and minIndex to char would allow this to work?