As monkey_king points out there is a variety of options. Your question is similar to asking "How do I make cookies?" In order to best answer your question we need more input or make our best guess as to what you need/want/know.
Do you know there are multiple types of strings? If so, which type are you planning to use?
If you're not using STL strings do you know how to manipulate C style strings using functions like strcmp(), strcopy(), etc?
Do you know about STL classes such as vector and string? If so they can make programming easier by handling a bunch of tasks for you. If not, so be it. You can still write valid, portable code without using them.
If you are using C style strings do you know about multidimensional arrays?