As someone who might be aspergers I sympathise.
Basically the emojis are in themselves "words" that people add on; adds another dimension to language if you will. The issue is that the context of which is pretty confusing and I don't actually understand half of them, so I don't use them and I make sure my friends don't either. That said there are some common ones that crop up that are worth "understanding", regardless of if you agree or not.
Smiley face is the helpful or happy emoticon. Big grin / laughing is funny or cool. The crying eyes but laughing (hate that one!!) is funny as well. Sad face is ... well yeah.
Emoticons rarely mean anything, especially given their ease of use. Girls are, in my experience, particular bad in this field for overusing emoticons which strips them of any emotional value.
Anyway as for making friends, it's a case of trying to find people with similar interests or hope they find you interesting. At that stage it's a case of talking to them further but this is the hard bit: it's knowing not to do too much, nor too little. ( I can't quantify it, sorry)
And "shutting out" I suppose means don't ignore people if they are uninteresting? Idk but this is where I might disagree, but then again I'm happy with my few friends that I have and equally happy ignoring the riff raff that is the rest of the year.