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I don't get it. I think my problem is to declare the correct data structure?

// additional .h files
#include <CGAL/Triangulation_vertex_base_2.h>
#include <CGAL/Triangulation_vertex_base_with_info_2.h>
#include <CGAL/Triangulation_data_structure_2.h>

struct K : public CGAL::Exact_predicates_inexact_constructions_kernel {};

// Traits
typedef CGAL::Triangulation_euclidean_traits_xy_3<K> Gt;

// Data structure with info
typedef int Index;
typedef CGAL::Triangulation_vertex_base_with_info_2<Index, K> Info;
typedef CGAL::Triangulation_data_structure_2<Info> Tds;

// Triangulation constructor
typedef CGAL::Delaunay_triangulation_2<Gt,Tds> CDT;
typedef K::Point_3   Point;

typedef CDT::Finite_faces_iterator Finite_faces_iterator;

How do i assign indices to the vertices? Section 29.11 does not really help 
me.
I'm new to CGAL.