i have the following code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public class ThreadWork
        {
            public static void DoWork()
            {

            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            ThreadStart myThreadDelegate = new ThreadStart(ThreadWork.DoWork);
            Thread myThread = new Thread(myThreadDelegate);
            myThread.Start();
            // Begin communications
                  serialPort1.Open();

                  serialPort1.Write("AT+CMGF=1\r\n");
                  //Thread.Sleep(500);
                  serialPort1.Write("AT+CNMI=2,2\r\n");
                  //Thread.Sleep(500);
                  serialPort1.Write("AT+CSCA=\"+4790002100\"\r\n");
                  //Thread.Sleep(500);
        }




        private void serialPort1_DataReceived_1(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
        {
            string response = serialPort1.ReadLine();
        this.BeginInvoke(new MethodInvoker(() => textBox1.AppendText(response + "\r\n")));
        }
    }
}

what i am trying to do is send AT COMMANDS to my phone which is attached to the computer through USB

1. how do i know how to configure the properties of the serial port? (like which COM is the phone on [it's attached through USB], what about baudrate and databits?)

2. when i run the program nothing really happens, i would like to send AT COMMANDS to my phone and the textbox is there to receive the response from my phone

3. this is my first time using threads. am i using them correctly? what is the purpose of it in the current example? is it to just have a delay between send a response?

what am i doing wrong?