How can I set up a two-way shipment for my online store?

[crazyjapanese11]

Hi everyone, i have 2 questions about the shipment, im about to make my store but its a little hard to set up the shipment. 

I am trying to first use this one

Enable third-party calculated rates at checkout

Don't understand what should I Update to get those rates. 

Second question is: 

How can i make 2 profile for all the products that i have. I have express shipment for all kind of weight, but then i have cheaper option for packet till 2kg. 

Is it possible to manage it?