Next week I am flying into NRT and plan on taking NEX to Shinjuku.

I just want to confirm the process of buying the NEX combo pass.

Are the JR pass and the Suica and NEX combo different items? Do both of these need to be validated?

Once I arrive in NRT and clear customs I go to the JR East ticket office. Do I need to fill out an application to get this combo pass? I was reading somewhere you need your passport, railpass order then application form... Is all that needed for NEX combo?

I will be arriving on CO7 around 14:30. I also saw that not all JR offices were open at that time? They had morning and evening hours.

Thanks!