How to implement copy constructor for very simple singly linked list in C++?

I am having quite a bit of difficulty understanding how to implement a copy constructor for a singly linked list in C++. Heres is the code I have for the implementation:

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struct node {

string value;

node * next;

};

class strSet {

private:

node * first //points to the first node of the object;

public:

...

strSet (const strSet& copy);

...

};

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I am having difficulty implementing this copy constructor. Can anyone shed some light? I'm not sure what to put in the body.

strSet (const strSet& copy) {

...

}

The other public member functions don't relate to the copy constructor. I'm suppose to do a deep copy manually.

Do I need to make 1 or 2 temp variables? I know I need one that goes through the list we're copying from because we don't want to change the original variable.