air drill question

Thanks for posts. Just starting out . Have some manuals but none with
this information. What would be the gold standard of reference manuals
for this information. Had wanted to buy a drill for mostly #30 and 40
drill bits but was at a loss with all the rpm ranges. Sounds like for
aluminum I should be looking at a higher rpm range than I originally
thought.
I had thought this group was amoung other things to use members as a
resource. I suppose I shouldn't be suprised that someone should
criticize me for asking what to some might be obvious, but I don't
think this is a community that eats its young. I might need some more
help in the future. KM