I'll help you out. Change your control setting scheme to type 4. That makes it easier imo. L3 to sprint. R3 for burst. When you spawn, at the bottom right of the screen when it say "level 1 ________" whatever burst you have equipped press R3 to use it. They're sort of like little medal kickbacks so to speak. Oh and put "aiming acceleration" to 10. That makes it so the speed when aiming doesn't start off slow and gets fast as you move the analog. It basically makes the aiming similar to Uncharted 3.
That white vertical bar that fill up from kills and sh1t lets you do that slow mo dive. It's done by pressing R2 and whatever direction. Press it again to stop it. If the meter doesn't have nothing then it'll dive but not be in slow-mo.
When you notice the screen is in slow-mo and you ain't press nothing that means someone else is doing it in your sight of view.
Mess with the "Arsenal" screen and fukk with the loadouts to see what they do. You'll get a feel for it the more you play.