That's a very broad base and question. what type of video, purpose, subject matter etc because what you might need will vary substantially. This has changed dramatically in past year or two. some manage with a top of the range smart phone, others using cameras/mics such as DJI pocket 3/mic2. Then the dslr or mirrorless brigade. Video capture is only the start, then it's transforming that into the end product. Use what you have already to get started, don't invest until you've decided the direction you are going to take, prices and availability change for the better with time, it's getting much less expensive in general for beginners.
People to watch on youtube...Jeven Dovey, Vince Opra, The Drone Creative (Pocket 3 and drone), they will lead you on to others to get motivated and started.