Hey guys I'm new to battle net I've never played wow.

This might seem like a "newb" question but for the life of me i can't figure out these:

-How do i know my full battle tag? Blizzard's website says it's the name, number and phrase? Where do i find that? It's written that i can find it on top of the friends list but all that is written is "social" I know my name and number but what is the phrase they're talking about?

-whispering: How do i whisper to someone not in my list? /w and then what exactly? writing a name and battle tag like /w nobody#1398 hello, doesnt work..

-Adding friends or inviting someone not in the recent list. Is there a way to add someone not in the recent list? For example I want to play with someone but he's not in my recent list anymore. What exactly do I have to write? I can't even whisper to him.

It's a lot of questions but it would really help me out.

Thanks!