1997 ford explorer xlt awd 5.0 v8 143,000 miles on it.

i have to replace the a/c pump on my explorer. it came with these
round shims,and a long inline filter. where does the filter go and it
says the pump dosent come with the oil. how much oil do i put in it or
does the 134a come with the refill kit and how much oil do you put
in. ? oh i got the pump w/clutch for 178.00 at auto zone and its a
remanufactured one. 3 mo warranty on it.i replace one in a car once
but never in an suv. the car was easy. and also the relay burnt up in
it.
help plz.