Shipping from Mexico

I just started my sellers account on amazon, and I just have one question, what do I need to send inventory from Mexico to the amazon FBA warehouses on USA. How do I ship it? Do I need a customs licence to export goods from Mexico? What shipping company can I use to send my inventory to FBA on the US? How much does it cost and what is the best option to send my inventory? Thank you, hope someone can help me.