OpenGL- glFrustum, glLoadIdentity and glLookAt Confusion - opengl

Question

I am trying to achieve a perspective view for a rectangular plane in the X-Z axis like below.
The code below almost achieves that.
What am i doing wrong? I find the documentation to be lacking/confusing.
#include <GL/glut.h>
const int RED_COLOR[3] = {255, 0, 0};
// color to draw in
void setDrawColor(const int decimalCodeRGB[3]) {
float denominator = 255.0;
//convert to float
float r = decimalCodeRGB[0] / denominator;
float g = decimalCodeRGB[1] / denominator;
float b = decimalCodeRGB[2] / denominator;
glColor3f(r, g, b); // set draw color
}
void drawPlane() {
GLfloat A[3] = { -1, 0, 1 };
GLfloat B[3] = { 1, 0, 1 };
GLfloat C[3] = { 1, 0, -1 };
GLfloat D[3] = { -1, 0, -1 };
glBegin(GL_POLYGON);
glVertex3fv(A);
glVertex3fv(B);
glVertex3fv(C);
glVertex3fv(D);
glEnd();
}
GLfloat CamX = 0, CamY = 2, CamZ = 1;
// Display Call Back
void draw() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear all drawings in buffer
glLoadIdentity();
gluLookAt(CamX, CamY, CamZ, 0, 0, 0, 0, 1, 0);
drawPlane();
glutSwapBuffers();// Render Now i.e convert Buffer to Picture
return;
}
// Initialization
void initialize()
{
glClearColor(0.1f, 0.1f, 0.1f, 0.1f); // Set Background Color
setDrawColor(RED_COLOR); // sets the drawing color to red
glEnable(GL_DEPTH_TEST); // enable viewing the 3d
glMatrixMode(GL_PROJECTION); // change to perspective projection
glLoadIdentity(); // what does this do?
glFrustum(-1, 1, -1, 1, 2, 10); // what does this do?
glMatrixMode(GL_MODELVIEW); // what does this do?
}
// Main
int main(int argc, char* argv[])
{
glutInit(&argc, argv); // Initialize GLUT
int x = 512, y = 512; // x and y value
glutInitWindowPosition(
(int)(glutGet(GLUT_SCREEN_WIDTH) - x) / 2,
(int)(glutGet(GLUT_SCREEN_HEIGHT) - y) / 2); // Position the window's center
glutInitWindowSize(x, y); // Set the window's initial width & height
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); // initialise the buffers needed. double buff, one for RGB color the other for x,y, z
glutCreateWindow("3D Bowling Game"); // Create a window with the given title
initialize(); // Custom initialisation
glutDisplayFunc(draw); // Register display callback handler for window re-paint
glutMainLoop(); // Enter the event-processing loop
return 0;
}
// End
How do I change the camera to 45 degrees to Z axis?
Am i calling the functions in the right Order?