What is the right way to design class of functions with selenium by POM?

i was required to do assigment of selenium by POM design. I created class of functios and there i'm using with functions in main. My question is if i did it well and if i didn't miss something, like if the design of POM is correcet and if i should add try and catch each function or other things.

//Function class
  public class Functions
    {
        IWebDriver driver;
        static string path = Path.Combine("DataEX.xlsx");     
        XSSFWorkbook workbook = new XSSFWorkbook(File.Open(path, FileMode.Open));

        public Functions(IWebDriver driver)
        {
            this.driver = driver;
        }

        public void OpenBrowser()
        {
            driver.Navigate().GoToUrl(url);
        }

        public void existsElement(string cssselectorName)
        {
            try
            {
                WebDriverWait wait = new WebDriverWait(driver, TimeSpan.FromSeconds(10));
                wait.Until(SeleniumExtras.WaitHelpers.ExpectedConditions.ElementIsVisible(By.CssSelector(cssselectorName)));
            }
               catch(Exception e)
            {
                throw new Exception(e.Message);
            }
        }

        public void Click(string cssselectorName)
        {
            driver.FindElement(By.CssSelector(cssselectorName)).Click();
            
        }
        public void Set(string cssselectorName,int row_from_file, int col_from_file)
        {
            var sheet = workbook.GetSheetAt(0);
            DataFormatter formatter = new DataFormatter();
            var value = formatter.FormatCellValue(sheet.GetRow(row_from_file).GetCell(col_from_file)).Trim();
            driver.FindElement(By.CssSelector(cssselectorName)).SendKeys(value);

        }
        public void CloseBrowser()
        {
            driver.Close();
            driver.Quit();
        }
    }

//Main class

 public class UnitTest1

    {
        [TestMethod]
        public void TestMethod1()
        {
            IWebDriver driver = new EdgeDriver();
            driver.Manage().Window.Maximize();
            Functions function = new Functions(driver);
            function.OpenBrowser();
            function.existsElement("div[id='header_logo']");
            function.Click("div[class='header_user_info']");
            function.Set("input[id='email_create']",1,2);
            function.Click("button[id='SubmitCreate']");
            function.existsElement("form[id='account-creation_form']");
            function.Click("input[id='id_gender1']");
            function.CloseBrowser();


        }
    }