It depends how you want to promote it. If you want to promote it with people around you, Facebook, Instagram, snapchat, or Twitter are the best ways. But if you want to be like a shocker to everyone just promote it to your online friends who don't know you in real life. To grow your channel, you have to be you, that's key. You will find people like your personality at all times. Best way to edit your video and audio is the software your computer brings. For example, I'm new so I use iMovie because my Mac has it. It's really easy and fun to use. Hope you find this as a motivation and check out my channel. Appreciate it bro, thanks.
~XxiTearZzxX