you need oil to pube them up for the moving parts etc

if you are spraying you need to have others tuff to filter out the oil

you can get in line oilers as well

the best place i've found for this sort of info is machine mart, but it does also depend on how long you are going to be using the tools for and don't forget to drain the compressor every night otherwise the water inside tends to rust it up inside out

if you don't want to go in line oiler then a few drops of specific air tool oil in the connection every morning will do the trick