from one ENFP to another: i have two good ISTJ friends. my one friend is an excellent musician so i help him record his music and give him advice on structuring his songs. basically, we do something, which tends to be a scheduled thing. i do this every saturday with him. while im doing so we can discuss modern events/politics, women, music, cars, movies, and whatever. my other ISTJ friend I currently go to the gym with. at the gym, i do the same thing as my other friend, talk about whatever. i found that with ISTJs a common interest is a good thing to have because it opens up conversation quite a bit easier. its even better if its a scheduled thing. this is, of course, all my own personal experience. ya, dont talk about emotion unless they bring it up. and in my experience, they only bring it up if they REALLY need help. the gym friend never has, the music friend has on multiple occasions but only when he REALLY needs it. i never bring it up.