Fire it first in a safe manner just in case it has a pellet in the barrel to make sure air is getting through then Try and find a pellet that its already set up for,
Usually set to Field target trophy or crosman premier. Little allen adjustment screws on the shuttle change the pellet lengths for feeding,
If your holding air then thats the main thing, For the seals,,, Look down inside the rifle and you should see the little center hammer pip. The hammer hits the little pip that in turn hits the bottle valve, You will have to dry fire the rifle with no bottle and the pip will come out if you ever need to change that little seal, The other larger seal you can see is just to seal the bottle. Very simple in design. Just the pellet shuttles that looks a bit daunting but easily doable by the owner.
Someone once said when you stop chopping pellets in half then you have nearly cracked it.
They didnt come with instructions, Just an A4 sheet of paper with a diagram of which way to put the hammer pip in and to fill to 180bar. Will have a copy somewhere.
Tried selling a few in my collection in the past couple of months with no takers but plenty swap offers. Col.