Filming at night with my Nikon d5100

Outdoor daylight and indoor artificial light are totally different. You will need to use several multiple light setups, depending on the location. If you are doing interview type movies, you may want to use umbrellas with the lights. You may want to get more complex and light people with portrait lighting setups.

You did not specify what you were going to do indoors, but it is going to involve using lights. And with a limitless amount of scenarios, it will be alnmost impossible to cover all here.

I suggest that you watch interviews and documentaries and observe what kind of lighting that the pro videographers use.