It's nice when a broody does it all for you, but you don't have to make it too complicated in a brooder.
Having the heat at one end is great. Don't worry about that 90 to 95 the first week and dropping it 5 degrees a week. Just keep one end warm and let the rest cool off as it will. They'll find their own comfort zone as long as the brooder is large enough and well enough ventilated it can cool down. You'll notice with a broody they'll be out playing in really cool temperatures and just go back to Mama to warm back up when they need to. Same principle.
You can put all kinds of stuff in the water if you want too, vinegar, sugar, electrolytes, hummingbird syrup, whatever. It won't hurt them but mine get what they get with a broody. Pure clean water. Nothing added. They don't need that other stuff.
The general recommended progression with feed is Starter the first 4 to 8 weeks, then Grower from whenever that bag of Starter runs out until you switch to Layer. There should be something like that on the bag of feed. But many of us do it a lot differently and the chicks do fine. You don't have to be exact or precise. The general idea is a higher protein feed the first month or two to get them off to a good start, then lower the protein so their growth rate slows down to stay in tune with how fast the skeleton grows and their internal organs mature. Starter is probably 20% or a little higher in protein, Grower is somewhere around 16% protein, same as Layer. The only significant difference in Grower amd Layer is that Layer is high in Calcium, which can harm growing chicks. The only significant difference in Starter and Grower is the percentage protein.
You can raise them from day 1 on Grower if you want to. They will do fine, just grow slower. You can raise them on a 20% Starter if you want until they are grown. They will do fine, just grow a little faster. I would not use a Starter higher than 20% protein after the first couple of months though. You don't want them maturing too fast.
If you have decent forage a broody will raise the chicks without you providing any feed. Chickens have been raised like that for thousands of years. A lot of us make this a lot more complicated than it has to be.