Use OBS to record your video, and audacity to record your audio. Sync them together to get the best video quality, then render it at 720p (or 1080p if your hot). Another tip is always try to engage and speak in your videos, and cut out the parts where your saying "Uhm...", "And..." or "So...", people in this age won't wait for you to say what you wanna say, so you gotta say it as fast as you can.