Note that the Narita Express will arrive at terminal 3 & 4 and Yamanote line to Shibuya is Terminal 12. The yellow one is the escalators which can help you to carry your luggages.
If you travel from airport to 新宿 by 京成本線, you can buy one ticket i.e. 1190 yen.
If you travel from 新宿 to airport by 京成本線, you have to buy one ticket from 新宿 to 日暮里 190 yen. In 日暮里, you have to give your ticket to the ticketing office and buy another ticket (1000 yen) to airport.