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How do I keep my laptop's battery in good health?

Lithium battery such as Li-Ion and Li-Pol has no memory effect.
Li-Ion has cycle life between 400 and 1200 cycles (most of them 800-1000), Li-Pol about 500-800 cycles. But it mean full cycle. If you discharge battery by 1% and then charge it to 100% it does not mean full cycle. Only 1% of full cycle.

Lithium battery must not by priming (or formatting). They do not need it. Formatting lithium battery just short their life.
Deep discharge is harmful.

In regard to Lithium battery has no memory effect I recommend charge laptop battery anywhere and anytime you can. Battery can powering standard notebook for about 2-5 hours (ultramobile notebooks can last more than 10 hours). It is very short time so everytime you have oportunity, charge!

But if you use laptop only in home, look for settings and try find function for extend battery life. Many modern notebooks have such function (in various names). It charge battery to maximum 80%.

If your laptop does not leave even your desk, charge battery to 50%, unplug battery from notebook and store it in 15°C. Twice per year check it. If voltage drop under 3 volts per cell, charge it again to 50%.

How do I choose a good laptop battery?

Only one voltage will fit one laptop, but I suspect a typo in your source - they all have the same voltage. The larger capacity is definitely better because it will make the battery last longer for 2 reasons: Less cycling thanks to the higher capacity is the obvious one. But there is also an added benefit - the laptop consumes the same current as before, but now there is more surface area of electrodes. This means lower current density prolonging the life of the cells.

Is it really necessary to charge a laptop battery for 8 hours before first use?

Probably not really. They want you to start with a full charge to get the best experience, knowing what the charge level is may not be obvious to a new user and they don't want you to suffer a power shutdown and think its not working right. Having any kind of minimum charge is not always guaranteed - it might not come on at all, depending on how long it sat on the shelf. With popular products and slow discharging LiIon batteries you frequently have a significant charge, but they keep using the old instructions to charge it completely before first use.

If you are a experienced user, my experience is that I have a lot of initial excitement and am curious if it works at all. I'll observe the battery level and if there's enough for a quick explore, I'll satisfy my curiosity. No electrical damage can be done by turning it on. They just want to ensure a uniform result.

Does overcharging a laptop battery harm it?

To overcharge a battery you have to willfully maltreat it in some way. It is not possible to damage a battery with the supplied charger.

By definition ‘overcharging’ will cause damage. You can do this by messing with the charger circuit. Lithium batteries, as used in computers and phones, are very sensitive to charge voltage and heat. They are dangerously sensitive. The manufacturers take great care to avoid problems that could cause fires and explosions.

Do not modify a charger.

The consensus is that excessive discharge and storage in a discharged state are the most damaging modes of use.