A couple of guidelines for combat / dogfighting...
Keep your throttle in the blue zone (on the right of your scanner) as this gives you the greatest maneuverability, and then use directional thrusters to move about.
Try to learn a little bit of FAOFF, just to increase your turn rate, which will give you the best chance of getting behind, above or below your enemy, even if only for a few seconds. It's not vital, but a useful trick to have.
As above, turrets or at least gimballed weapons if your aim is not great. Keep in mind that NPCs will spam chaff if you use gimbals, so use the time they are doing that to let your weapons cool down and your WEP capacitor to refill.
For pips, start with 4 to SYS for strong shields, and 2 to WEP. Personally now though I prefer 3 1/2 to SYS, 1 to ENG and 1 1/2 to WEP. It really does depend on your load out, but the 1 pip to ENG does seem to increase maneuverability. As you get more experienced you can alter pips during the fight to put power where you need it.
Most importantly however is this. Check on the rank of the NPC you are thinking of engaging. Competent and below should offer much easier fights, and Expert and above, especially from Dangerous up can be quite a challenge. Try to evade or escape from higher ranking ones until you start to get the hang of combat, and practice against those lower ranked ones where you will have a much greater chance of success.