ive completed many a CZ in my Viper MK4. even forced a Majestic Class Interdictor to retreat because i killed all of its air conditioning units. melted all their icecream.
why?... because they are not very difficult.
If you want money just farm Hazardous resource extraction sites.
With kill missions, CZs will make HazRES payouts seem like chicken feed.
Up until about 4-5 months ago I had a fleet of 6 ships & <100m cr after playing for 2+ yrs. Until one CG where the system was also at war...I abandoned the CG & started stacking kill missions for the faction that was spawning the most missions (meh principles/ideologies? They just hold a man back). When I became allied with the aforementioned faction I was being offered kill 108 ships for 22-25mil.
I played the relog game ofc (sorry purists...but well, how can I explain myself? No I can't really...so eff u

) & stacked three of these when possible - earnings were in the region of 70mil every two hours, which as an hourly rate is errrrrr...hang on I got this one!...errrmmm...no don't tell me!...well, between 30 & 40 mil anyway!
That week I'm pretty sure I made about 200m cr & got my promotion to Elite. I still do these missions when I come across them, but I now have 800m cr hence cash isn't really a priority now - OP? you need to look for systems at war or civil war & bear in mind that there are often more than two factions fighting & you might have to go hunting in different areas of the system for a CZ with the relevant faction.
I used a Vulture with fixed efficient pulses...this should be your ship & load out of choice (maybe with gimbals if you are a bit rubbish) if cash is tight because to survive, you need to kill things quickly. You
can use any ship, but progress is slow with anything worse than a Vulture because CZ ships are much tougher than usual pirates etc especially their hulls. I recently killed 54 ships for a mission with my DBX with lightweight everything as an experiment in how crap NPCs are. I even used D thrusters & D power distributor with 3 x class two lightweight pulse lasers & a class 3 shield...but I did complete the mission in one sitting! Experiment conclusion: Yep, NPCs are very crap indeed
But it took forever & I had to run away a lot because sometimes this happens in CZs
For the optimum CZ tactics just use the search function on this forum as it has been discussed to death with numerous threads or just wait a couple of days, I'm sure another thread will be along soon, possibly even here.