WatiN Help C#

hi i'm trying to do the first WatIn  tutorial thing and i seem to be getting stuck and don't know why

here is my code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NUnit.Framework;
using WatiN.Core;
namespace GettingStarted
{
    [TestFixture]
    [RequiresSTA]
   public class Class1
    {
        [Test]
        public void Should_start_google()
        {
            using (var browser=new IE("google.com")) 
            {
                browser.TextField(Find.ByName("q")).TypeText("hello");
                browser.Button(Find.ByName("btnG")).Click();
            }
        }
    }
}

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and the errors are

Warning	1	A reference was created to embedded interop assembly 'c:\screencasts\GettingStarted\packages\WatiN.2.1.0\lib\net40\Interop.SHDocVw.dll' because of an indirect reference to that assembly created by assembly 'c:\screencasts\GettingStarted\packages\WatiN.2.1.0\lib\net40\WatiN.Core.dll'. Consider changing the 'Embed Interop Types' property on either assembly.	c:\screencasts\GettingStarted\GettingStarted\CSC	GettingStarted
Warning	2	A reference was created to embedded interop assembly 'c:\screencasts\GettingStarted\packages\WatiN.2.1.0\lib\net40\Microsoft.mshtml.dll' because of an indirect reference to that assembly created by assembly 'c:\screencasts\GettingStarted\packages\WatiN.2.1.0\lib\net40\WatiN.Core.dll'. Consider changing the 'Embed Interop Types' property on either assembly.	c:\screencasts\GettingStarted\GettingStarted\CSC	GettingStarted
Error	3	Program 'c:\screencasts\GettingStarted\GettingStarted\obj\Debug\GettingStarted.exe' does not contain a static 'Main' method suitable for an entry point	c:\screencasts\GettingStarted\GettingStarted\CSC	GettingStarted



how do i fix this to get this to run

thanks