The truth is that you can spend as much or as little as you want on your video gear. You could start by using the built-in webcam on your laptop or the smartphone you already have. However, good audio is a must so also get an external mic for between $20 and $100. If you are looking at mid-range gear, you could get a mirrorless camera, external short shotgun mic, a tripod, and softbox lights for under $1,000.