Aight, first thing's first. Make sure you is bang on slang. Which means you must have a rhythm to the way you speak. If you has no rhythm then make your own up. In the words of Ruddy G, rhythm is too restricting. Create your owns.
Aight, so you is knowing I is adding more vocab when I can be arssed (not like that!). But you is to feel safe knowing that these few word 'ere will help you get along just fine. Just don't try to speak too much and say aight a lot. Aight!
Yo, dis one is the most im-po-tant of all the vocab you is to learn. Aight means 'ello and it also means yes. If you is to see one of your homies on the street you is to say, "aight!". A fat boom batta hand shake is also "comp-plee-men-treee", (dis means it go well with), saying aight when you is seeing your homeboy, homegirl, whatever.
Well you best be boy! Or girl. Aight, new term, feeling me. I gave you a breif description earlier but now to put it into practise with proper homie speak. After you have made a certain point in "con-ver-sation", like you have told someone your personal look on life, you is to say "you feeling me?" at the end of it. Like, "Hey hasn't she got a booty? You feeling me?" But make sure you is looking hardcore when you is saying it, or your homies might be thinking you is wanting a bit of their batty's milk. Act tough or they is getting rough.