Welcome to Nikonites Jojoe. Which lens/lenses do you have with your D3100? When I got mine about 1 year ago
it came with the Nikkor 18-55mm VR f/3.5-5.6G ED AF-S DX Zoom Lens. Which is a very good kit lens, but for indoor
shooting I recently acquired the Nikkor 50mm f/1.8G AF-S FX Lens, due to its low light ability. And a Nikon SB-400
Speedlight flash unit, which I am still trying to figure out. (I need to work with it this weekend, to learn it)
You can also go on
You Tube. com and type
Nikon D3100 in the search box and a bunch of (some short and some very long)
instructional videos covering a myriad of topics will pop up look for the ones that interest you and get to watching.
You do that and read the manual and soon you will be posting some great pics for all of us to marvel over.:smile-new: