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It is highly unlikely you will kill your chicks! You may have some die, but that is often not preventable.
Wrong brooder temps and drowning are probably the most common causes of preventable deaths -- and maybe insufficient room.
Putting some marbles or similar sized pebbles in your waterer for a few days will prevent drowning.
Temp recommendations are just that, recommendations. Your chicks will tell you if they are too hot or cold, if you watch them and give them enough brooder room to get away from heat or move toward it. If you ordered more than one breed, it is likely they will vary in their desire/tolerance for heat.
If you are using a heat lamp, use red light. White light stimulates them and interferes with rest, IMHO. If you clamp a brooder light onto something for them, make sure there is a backup system to keep the light from falling into the brooder in case the clamp fails. A heat lamp can certainly set pine shavings on fire. I like to cover the pine shavings with paper towels for 2-3 days, so they can learn what is food and what (pine shavings) is not. Personal preference.
Probably the next most important thing is simply to observe them. Check them several times a day if you are home to do this. Again, they will tell you if they have a problem. If you are not at home, be sure there is plenty of water.
Sugar water, vitamins, and electrolytes are good if they were severely stressed, but not necessarily necessary, although shipping is certainly stressful for them.
All they really need is food, water, and warmth for a few weeks. Unless you live somewhere really dry, or you had them vaccinated for coccidiosis, I would go with medicated feed. Med feed is not med with an antibiotic. The drug is Amprolium, which slows the growth of cocci, but does not interfere with their developing an immunity to cocci. When they are old enough for grower or layer, they should not need med feed any longer.
If you can provide a heat lamp in the coop, you can put them there as early as 2 days, depending on where you live. You did not give your location. Likely you could brood them in their coop in June, almost from arrival, or within a few days. Again, their behavior will tell you.
My minimum for brooder space is 1.5 sq ft per chick, which will hold them for 8 weeks at most. It can be as little as 0.5 sq ft per chick if they will move to a coop in 2-3 weeks.
However, at any age, more space is always a good thing. In a couple of months, I will have about 20 hens in a coop that provides about 6 sq ft per bird, and they will have access to their run all day, which will provide over 250 sq ft per bird. This is a lot more than the recommended minimum here, which is 4 sq ft per bird in the coop, with a 10 sq ft run per bird. I understand that 87+ sq ft per bird in the run is the minimum to maintain vegetation in the run. Have not had my chicks long enough to know. My older small flock is true free range, and ranges over about two acres, though they could go much further if they chose. At 10 sq ft per bird, there will be no grass/weed growth after a short time.
More info than you were looking for, no doubt, but thought maybe I could help.