Shipping

I need help learning how to setup shipping costs for a shop.

There are eight prices for shipping that will need to be setup and are as follows:

US
Class 1: $7.95 for the first item, $3.90 per addition item in order
Class 2: $8.95 for the first item, $4.90 per additional item in order

International
Class 1: $17.00 for the first item, $14 per additional item in order
Class 2: $19.00 for the first item, $16 per additional item in order

How do I set them so that they will automatically total on the order and the buyer only needs to select local pickup or shipping?

Thanks!
Joy

http://ww.wp.xz.cn/extend/plugins/woocommerce/