fist command should always be
hw tune
This tunes your antennas, and is a good starting place.
Then you need to decide what you are trying to clone.
So probably the best generic starting commands would be
lf search
or
hf search
depending on Frequency you want to clone, once you have done that, let us know what we are looking at and we can direct you to some more specific commands
UPDATE
As always, @compgeek has posted while I was typing (happens more often than you’d think!) 
Proxmark for Cyborgs - Getting started and cloning your first badge!
Agreed, do this 
Agreed, I also normally give this “warning”