Express goes through FedEx or DHL and arrives at your door step 3-5 days. They have their own clearances and nothing you need to stress.
Once you go bigger, like minimum of 20 boxes, you'll start shipping Ocean Freight which will set you back like 1200-1500 dollars but saves you a ton of money. It'll take 30 days.
When you handle Freight you'll need ISF filings, bill of ladings, customs clearances, duty fees, etc etc.