Heres the main stuff i found if anyone could please help ( i apologise for my ignorance on the topic

but thats why I'm here , isn't it? )
Lens Cap 37mm for Coolpix 8700
Lens Cap 52mm for Coolpix 8700
Lens Cap 58mm for Coolpix 8700
Lens Cap 62mm for Coolpix 8700
Lens Cap 72mm for Coolpix 8700
site #2:
System compatibility: The Coolpix 8700 is compatible with a broad range of quality accessories, including Wideangle Converter WC-E80, Telephoto Converter TC-E15ED, Fisheye Converter FC-E9, Remote Cord MC-EU1 and Lens Hood HR-5700. This also includes Lens Hood HN-CP11, which accommodates the attachment of a lens filter (77mm dia.).
The Coolpix 8700's flash hotshoe works with a broad range of Nikon's external SB-series Speedlights for even more flexibility in flash photography. The AA Battery Pack MB-E5700 is also compatible with the Coolpix 8700. (Offers vertical shutter release feature as well)
8x Zoom-Nikkor; 8.9 - 71.2mm [35mm (135) format equivalent to 35 - 280mm] f/2.8-4.2 with macro; 14 elements in 10 groups; all elements are made of environmentally friendly glass; Nikon Super Integrated Coating (SIC) applied; two glass molded ED lens elements included
Standard ISO hot-shoe contact with safety lock. External Speedlight Hotshoe connects to external Nikon Speedlight SB-800/50DX/30/22s; built-in Speedlight can be canceled when using external Speedlight(s)
Fisheye Converter FC-E9, Wideangle Converter WC-E80, Telephoto Converter TC-E15ED, Step-Down Ring Lens Adapter UR-E12, Lens Hood HR-E5700, Lens Hood HN-CP11, AC Adapter EH-53, Car Battery Charger (12V DC in) MH-53C, Remote Cord MC-EU1, Soft Case CS-CP11, Various size CompactFlash™ cards