Problem with "chars"

[xlp <xlp@emtel.net.co>]

Hi C people, first of all, I'd like to thank you this mailing list and kernel.org project to give us a place where C programmers feel free to ask their questions and the support is excellent.
I dont understand what's the way I should handle 'chars' on C. 
I need to code a C function that returns a char, I want to do this:
char foo();
main(){
	char bar*;
	bar=foo();
}
How should i declare the 'char' inside foo()?
How should i 'return' the char inside foo()?
How can i understand "chars" and pointers to chars?, I have a C books, but I dont get it, because ALL THE EXAMPLES are with chars like char foo[20], that is the easy way!, I want to handle char without a specific length!.

bye.