Need help with rules for shipping in drupal commerce
If you're taking the pure rules route, you'll need a single rule per rate. So if you have two (2) zones and three (3) weight tiers, you'll need six (6) total rules. For example:


Northeast
Rest of the US


And 


0-5 lbs
6-10 lbs
11+ lbs


Will be 6 total rules:


Northeast (0-5 lbs)
Northeast (6-10 lbs)
Northeast (11+ lbs)
Rest of the US (0-5 lbs)
Rest of the US (6-10 lbs)
Rest of the US (11+ lbs)


You may also find it worth your time to review Commerce Shipping Postal Code Weight and Commerce Shipping Weight Tariff.