Generate file with select + variable result

Question

I have basic knowledge in PHP and good in Mysql but I’m having a hard time I need to generate a select with a result, generate it on the screen where there will be a box to add quantity and after this list is marked generate a file with selections follows the code

<table>
<tr>
    <td bgcolor="#708090">Codigo</td>
    <td bgcolor="#708090">Nome</td>
    </tr>

<?php  
$conexao = mysql_connect("localhost", "root", "123456");
mysql_select_db("database") or die(mysql_error());

$sql = "SELECT codigo,nome FROM produto";//ORDER BY data DESC");
$dados = mysql_query($sql, $conexao);

while ($row = mysql_fetch_array($dados)) {
$codigo = $row[0];
$nome = $row[1];
//$classif = $row[2];
//$texto=$row[3];
//$linhas = mysql_num_rows($sql);

?>
<tr>
    <td bgcolor="#4682B4"><?php echo $codigo ?></td>
    <td bgcolor="#4682B4"><?php echo $nome ?></td>
    <td bgcolor="#4682B4"><center>[<input type="checkbox" name="<?php echo $classif ?>" value="<?php echo $classif ?>" >]</center></td>
    <td bgcolor="#4682B4"><center>[<input type="text" name="qtd" placeholder="quantidade">]
</tr>    
<?php
}
?>