Shipping Flat rate and UPS

Hi,
I'm having trouble getting the shipping to work.
I would like to set the shipping option in the checkout page as select list for Flat Rate and UPS.
-I also would like to set it to free shipping for total amout that is less than 10$
-Flat rate would be depend on 1. Canada, US and 2. international.
I don't know how to set up to get the shipping to work for Canada Post so I just use UPS as the other option.

I added the select list in the check out page (right after shipping country in the same table.
<select name="ShippingOption" id="ShippingOption">
<option value="" selected="selected">Choose an option</option>
<option value="Flat Rate">Flat Rate</option>
<option value="UPS">UPS Standard</option>
</select>

I added hidden field in confirm page:
<input name="ShippingOption" type="hidden" id="ShippingOption" value="<?php echo((isset($_POST["ShippingOption"]))?$_POST["ShippingOption"]:"") ?>" />

and added 'set session value:
<?php
if (!session_id()) session_start();
if((((isset($_POST["ShippingOption"]))?$_POST["ShippingOption"]:"") != "")) {
$_SESSION["ShippingOption"] = "".((isset($_POST["ShippingOption"]))?$_POST["ShippingOption"]:"") ."";
}
?>

I also set triggers in shipping the Shopping cart object (I didn't add other stuff in the trigger such as free for purchase that is less than 7$ and international, Canada and US) just because I want to try if the shipping opions work.

Here's what I have.
Trigger for Flat Rate
If the value of the session varable 'ShippingObtion' is = a value of 'Flat Rate'
Calculation Flate rate = 10$

Trigger for UPS
If the value of the session varable 'ShippingObtion' is = a value of 'UPS'
Caculation Based on UPS shipping qoute value

But the shipping cost doesn't show up in the confirm page.
I'm not sure if I missed any step.

I'm not sure if the 'eCart UPS Shipping' supposed to be in server behavier for both check out and confirm page? I might've added it when I was trying things out and don't know if these might caused the problem.

Please help. Thank you