Node *mknode (parameters);

To make a node you need to allocate memory for it, and initialize any values that need to be, for parameters you want to pass it anything that might change between nodes, like X and Y coordinates, but anything that remains the same, like speed, can be hard-coded into the function.

Node *rmnode (Node *);

List *mklist ();

List *insert (List *, Node *, Node *);

List *append (List *, Node *, Node *);

List *obtain (List *, Node **);

List *clearlist (List *);

List *rmlist (List *);