You have to complete a certain challenge for this specific kill streak, you pretty much just have to call it in a certain number of times. To check how many times u need to get the killstreak go to Barracks>Challenges>Killstreaks and just complete them to get the emblem. Hope this helped!
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you can unlock it with you're first killstreak award unlock
No unfortunately same as you can't level up in private matches
I don't know but there is a spotty nerd called Liam crumlish from barnfield south academy
You unlock it by getting to 10th Prestige.
you cannot unlock them you have to buy them on PSN or LIVE Marketplace