Let me just give you a brief introduction about your DSLR - Nikon D3100. The D3100 is the successor to the very popular D3000 and sports a 14.2 MP CMOS sensor and capable of recording Full HD video. A very user friendly camera created for beginners and professionals alike. The guide mode is a fantastic feature which guides the user about the various aspects of the camera. You can visit the website below for a detailed overview of features.
Now coming to the point, let me introduce you to the Best Accessories fit for your Nikon D3100.
Top 5 Must-haves for the D3100
SanDisk Ultra 32GB SDHC Card (SDSDRH-032G-A11)
Nikon EN-EL14 Rechargeable Li-ion Battery with Cleaning Kit
Hoya HMC Haze UV(0) - Filter - UV - 52 mm
Nikon SB-400 AF Speedlight Flash
SquareTrade 3-Year Camera/Camcorder Warranty Plus Accident Protection
Top 5 Tripods for the D3100
Manfrotto 055XPROB Pro Tripod Legs (Black)
Joby GP2-D1EN Gorillapod Flexible Tripod for Digital SLR Cameras with Bubble Level
Vista Explorer 60" Lightweight Tripod with Tripod Bag
Dolica AX620B100 62-Inch Proline Tripod and Ball Head
Joby GP3 Gorillapod SLR-Zoom Flexible Tripod
Top 5 Kit Lenses for the D3100
Nikon 55-200mm f/4-5.6G ED IF AF-S DX VR [Vibration Reduction] Nikkor Zoom Lens
Nikon 55-300mm f/4.5-5.6G ED VR AF-S DX Nikkor Zoom Lens for Nikon Digital SLR
Nikon 35mm f/1.8G AF-S DX Lens for Nikon Digital SLR Cameras
Nikon 70-300mm f/4.5-5.6G ED IF AF-S VR Nikkor Zoom Lens for Nikon Digital SLR Cameras
Nikon 50mm f/1.8D AF Nikkor Lens for Nikon Digital SLR Cameras
Top 5 Backpacks for the D3100
Lowepro Pro Runner x350 AW DSLR Backpack (Black)
Lowepro Pro Runner 350 AW DSLR Backpack (Black)
Caselogic SLRC-206 SLR Camera and 15.4-Inch Laptop Backpack (Black)
Case Logic Digital SLR Zoom Holster Camera Bag/Case (Black) (SLRC-201)
AmazonBasics Backpack for SLR Cameras and Accessories (Black)
Top 5 Books for the D3100
Nikon D3100: From Snapshots to Great Shots by Jeff Revell
Nikon D3100 For Dums by Julie Adair King
Nikon D3100 Digital Field Guide by Wiley
Magic Lantern Guides: Nikon D3100 by Simon Stafford
Nikon D3100 Jumpstart Guide (Tutorial DVD) by JumpStart