Create new google spreadsheet if sheet not exist in my spreatsheet

If you want to check if a certain spreadsheet (byName) exists or not, if not then create it. Now here i am find a sheet named "abonzer" , if not find then create it with 200 rows and 11 columns. Remaning cells Delete.

function initialize() {

   var ss = SpreadsheetApp.getActiveSpreadsheet();
   var mysheet = "abonzer";
   
   if (ss.getSheetByName(mysheet ) == null){
       ss.insertSheet('abonzer');
       var sheet = ss.getActiveSheet();
   
       sheet.deleteRows(200, 800);
       sheet.deleteColumns(11, 15);
   
    }
}