Basic Singly Linked List printing undesirable data

I am not an affluent programmer. My code for this linked list is printing what seems to be not only a series of endlines, but also a zero that I have no idea where it is coming from. You might notice that I insert values into the linked list using a for loop. Even before the for loop, the linked list contains a zero. Why? I assumed that when the linked list was created it would be empty. I really need to remove the zero from the data.

#include <iostream>
#include <cstring>
using namespace std;

struct Node{
  int key;
  Node* next;
};


void insert(Node* & List, int k, int posn){
  //assume 1 <= posn <= length of the List + 1
  if (List == NULL){
    List = new Node();
    List->key = k;
    List->next = NULL;
  }
  else if (posn == 1){
    Node* temp = new Node();
    temp->key = k;
    temp->next = List;
    List = temp;
  }
  else
    insert(List->next, k, posn-1);
}
void print(Node* List){
  if(List!=NULL){
    cout << List->key<<",";
    print(List->next);
  }
  cout << endl;  
}
int main(){
  
  Node* myList;
  myList = new Node();
  print(myList);
  
   
  for(int j = 1; j<=10;j++)
    insert(myList, j, j);
 
  print(myList);
  
}