So a few more questions i guess:
1. What are some "good brands" of brass? Also what makes some brass cheap vs other? What kind of corners are being cut in the manufacturing process that would make some brass inferior to others?
2. I noticed some surface rust on some of the exterior parts of the dies and press. Guessing this does not affect anything other than aesthetics, can i scrub it down and give it a coating of oil or something to keep it nice? I plan on getting some graphite powder to lube up my powder thrower and i already have some rubbing alcohol to wipe everything down.
A lot of the cost difference with brass has to do with consistency. I will use two examples:
I shoot long range F-Class with a .300 win mag. My loads I develop for this are very accurate, like 1/4 MOA. I weigh each charge of powder, I weigh each bullet, and I make sure each case has: The same weight, the same volume, the same neck thickness, uniform primer pockets, uniform flash holes and is trimmed to the exact same length.
I have worked up loads in Norma brass which is about $1.50 each, and winchester brass which is about $0.50 each. The difference is, I have to put a lot more work into getting the Winchester brass to be as consistent as I described above. I have a lot of tools to work on cheaper brass to turn it into stuff thats as consistent as Norma or Lapua. I also have to buy at least 2x or 3x the amount of brass I am going to need so that I can cull some of it and sort it into batches.
With Lapua or Norma brass, it is all pretty much as consistent as I can make it right away.
Also, some brands like Lapua, have a reputation for durability. For instance, in my .338 Lapua Magnum, I first tried hornady brass and it was soft so at max loads it stuck in the chamber and I had to hammer it out with a cleaning rod. With HSM brass, it had no problem handling the load, but it wore out with loose primer pockets after 4-5 loads. With Lapua brass I got 10 reloads at Max pressure.
Its a cost/time/quality balancing act basically. With you being new, initially, I would buy quality brass like Lapua when accuracy is very important like long range shooting or hunting, and cheap stuff for short range targets and plinking. Experience will teach you a lot in this area.
But I will add this, brass brands often have different case capacities...so if you switch brands of brass (or any component for that matter including primers, bullets, and powder), You should re-work your load.
As for the rust, wipe it off or use some steelwool/wire brush to scrub it off and put a light oil coat on it to prevent it from happening again. Outside rust wont affect the internals of the die, but rusty threads are never a good thing.