If your’re just getting started, I’d recommend just sticking with what you’ve got (which is probably a DSLR and the Nikon equivalent of an 18-55 which is probably VR?).
As far as stabilizers and whatever else is concerned, it honestly depends on what your’re shooting.
I’ve shot over a dozen different films for several different people with my crop-sensor DSLR (Canon 60D) and 18-200mm kit lens (which is stabilized), and I’ve never really needed one (other than one I use rarely—literally made of a set of gym weights and some pipe we got at Home Depot). However, if your’re shooting a lot of handheld video (I.e. following people around with a camera for witness encounters) your audience might want you to have one!
That said, there are some bases you need to cover for your video.
#1 You want a good picture.
—You need a camera. DSLRs work well, but some lend themselves to video better than others. Start with what you’ve got, as it will get you well on your way! (Just briefly looked it up, and it looks good!)
—You need a lens. VR is good to have and helpful, but you can get by without it if…
—IF you use a tripod. This one thing is, next to your camera, probably the most essential thing you’ll need for video. However, it depends on what your’re shooting. I use my tripod every time I shoot video, but you might need to use your stabilizer every time because you are in a different shooting situation. Find something to stabilize your camera (it could be a table top at first! Just don’t handhold each shot with just your camera.)
#2 You need good audio
—Depending on what you’re shooting, you’ll want/need something to get better quality audio because what comes out of your camera isn’t often very good. This might mean an external microphone and recorder.
But start with what you’ve got, and get creative with it! Your camera audio will suit you just fine for a while, but when you’re ready to invest, this might be a good place to do so.
#3 You need something to edit with
—Start with what you have, or look for what’s inexpensive or free (iMovie on Mac or Windows Movie Maker on Windows; Adobe Premiere Elements might be worth looking into; do your research before purchasing/downloading any software, though, and make sure it’s what you need).
If you decide further down the road that you love this and want to do more, you can invest in something more full-featured.
Here’s a couple of things I’ve shot before. I certainly will not advocate the wholesomeness of everything on YouTube, but I know these particular videos are safe (I made them either for clients or for myself).