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@dadbike
You will have to play a bit with gearing to understand what best suits your needs.
For instance, I live in a very hilly part of the world and find that 63-65" works best for me as an all-purpose commuting and round town gear. This is for up to 25mi per day for me. I opt to sacrifice downhill speed for the ups, which are still quite hard in many places. I spin up to 200+ rpm on the decents. I use two brakes.
70" is often a good place to start.
The cheapest track cogs are stamped steel and prone to poor finish and threads stripping in use. Nicer cogs are finely machined, more round, and last longer.
Chains. They all work. I've used 1, 8, 9, and 10 speed chains on fixed drivetrains. The 1, and 8 speed chains last the longest for me. Also the least expensive options. The SRAM PC-1 is a finw chain and inexpensive.