Starting laser hair removal with sensitive, hyperpigmented skin, need advice

Hi! I’m 20 and I’m planning to start laser hair removal on my underarms and bikini area

I have very sensitive, fair skin, medium-thickness hair, and mild to moderate hyperpigmentation in both areas. I’m worried about laser making the pigmentation worse, so I’d really appreciate advice from people with similar skin and hair

I’ve heard that waxing 5–7 days before a laser session can give better results than shaving. Is this true, or can waxing reduce the laser’s effectiveness? Should I avoid waxing completely, and when should I shave before a session?

What can I do before and after each session to minimize the risk of burns, irritation, and hyperpigmentation? Are there any products or ingredients I should use or avoid, deodorant, fragrances, hot showers, or sun exposure?
For those who have had hyperpigmentation in these areas, did laser improve, worsen, or have no effect on it?

What type of laser device is generally best for my skin and hair type, especially considering my sensitive skin and hyperpigmentation?
Finally, what questions should I ask the clinic before buying a package, especially about the laser device, settings, cooling system, and their experience treating sensitive or hyperpigmented skin?