Math library PLEASE HELP!

Hey guys, I'm new to c++ and need to create a math library that is capable of doing the following tasks:

Create an Identity Matric
Create a Translation Matrix
Create a scaling Matric (uniform)
Create a Shear Matrix (non-uniform scaling)
Create a Rotation Matrix (about individual axis)

So far I have the following code but I'm fairly sure it's wrong as I get error messages and I know at some point I am going to need to use pointers and more void vectors.

#include <iostream>
#include <math.h>
class Vector2
float x;
float y;
float length;
float lengthSquared;
Vector2::Vector2(float xValue, float yValue)
xValue = x;
yValue = y;
float GetMagnitude()
length = sqrt( ( x*x ) + ( y*y ) );
float GetMagnitudeSquared()
lengthSquared = x*x + y*y;
void Normalise(float normal)
length = GetMagnitude();
normal.x = x / length;
normal.y = y / length;

If you guys could give me tips, point me in the right direction or even flesh it out for me as to give me an idea of what I'm doing wrong/next I would really appreciate it.
Use the boost math library
How would I go about that? looked it up and all I can find is 2 youtube videos which arn't exactly great.
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