I usually fly Delta Airlines from Seattle using their direct flight and upgraded seating Delta Comfort plus. Comfort plus allows for people like me 6'1" and over to comfortably travel with extra legroom and a more comfortable chair. 

At Narit Airport you can purchase a SUICA card. This is the easiest way to travel around the Tokyo Metro area. If you don't have one of these cards you will be inconvenienced by not knowing the appropriate fares and will end up with a chunk of change always in your pocket. You can also purchase from most convenience stores. Load this digital pass with about ￥5,000 and away you go!  

From Narita to Kasiwa Station is a little under and hour about 50 min. BE CAREFUL not to take the wrong train, or board one with reserved seating. 

From Kashiwa Station you can take the Tobu Noda line to Atago about a (36min) ride. 

There are many bars and pubs to go and eat at after training. We will be updating a list here little by little.