Look for books in your local library by John Darling. I believe he has passed away, but he is seen as the top source of information for people in the air rifle hunting scene. Some info seems a bit dated but for the most part it still holds true. He made a gun lamp for instance from a massive car lamp, strapped it to his head and wears a motorbike battery on a rope around his waist! Nowadays you can get lamps made to fit atop your rifle and they are incredibly bright, but you could tape a Tesco torch to your rifle, it has plenty of light output and is 8 quid!
If they don't have it in your local library, ask if they can get it in from another one or get it stocked in your library. They are good books and will teach you a lot of the basics.