Rewriting movement on tranform to Rigidbody2D

Hi! I have this player controls made with transform, but unfortunately I’m very new to code and can’t work further without Rigidbody2D. So I need to rewrite this transform controls to Rigidbody2d!
Code at pastebin : using System;using UnityEngine;using UnityEngine.UI;using UnityEngine.Even - Pastebin.com
`using System;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using UnityStandardAssets.CrossPlatformInput;

public class PlayerMovement : MonoBehaviour
{
public float verticalInputAcceleration = 1;
public float horizontalInputAcceleration = 1;

public float maxSpeed = 1;
 
public float rotationSpeed = 1;

public float acceleration = 1;

public float velocityDrag = 1;

//public Vector3 velocity;
private float zRotationVelocity;
private Vector3 velocity;
private void Update()
{
	// apply velocity drag
	velocity = velocity * (1 - Time.deltaTime * velocityDrag);

	// clamp to maxSpeed
	velocity = Vector3.ClampMagnitude(velocity, maxSpeed);

	// update transform
	transform.position += velocity * Time.deltaTime;

}

private void FixedUpdate()
{

	Vector3 direction = new Vector3(CrossPlatformInputManager.GetAxis("Horizontal") * horizontalInputAcceleration, CrossPlatformInputManager.GetAxis("Vertical") * verticalInputAcceleration, 0 );
	bool move = !(Mathf.Approximately (direction.x, 0) && Mathf.Approximately (direction.y, 0));

	if (move) { 
		float angle = Mathf.Atan2 (direction.y, direction.x) * Mathf.Rad2Deg;
		Quaternion rotation = Quaternion.AngleAxis (angle - 90, Vector3.forward);
		transform.rotation = Quaternion.Slerp (transform.rotation, rotation, Time.deltaTime * rotationSpeed);
		velocity += transform.up * Mathf.Max(Mathf.Abs(direction.x), Mathf.Abs(direction.y)) * Time.deltaTime * 0.1f * acceleration;
	}
}

}`

Is this the standard assets 2d Character-Controller code?
Anyway its hard to understand if you are new to Unity/Coding. You can use this 2D platformer code I made a while back. it uses Rigidbody2D and uses frame by frame movement instead of using axis.
It will work on unity 2017. Hope this helps you…