in the add to cart button, make sure a weight is being set, the shipping lookup will only return a rate if a weight is passed
in the USPS shipping settings, you have First Class selected as the service, this is only valid if the weight is under 13 oz.
for details on obtaining the FFed Ex details, see this tutorial:
http://www.webassist.com/tutorials/Online-shipping-solutions-eCommerce-Series