I personally use iMovie (my channel is called Daily Dalynn, btw) and think it works well for a beginner. I'd recommend iMovie to everybody who owns an apple device. Once you build up your subscribers, I'd recommend investing your money into a better editor. I wouldn't recommend diving in to deep or starting off with Final Cut Pro as it is very expensive ($300) but once you build up your audience and start investing more time into YouTube, you should invest your money into YouTube, to. iMovie is very easy to use, and you can try FCP out for 30 days free! Editing is important, but before you invest a lot of money into editing, I'd recommend investing in some good lighting because bad lighting can ruin a good video. If you don't want to spend $50 on studio lights, Filming in front of a window proves to have nice results. I'd recommend investing your money in good lighting, then a good editor, and then a good quality camera. iPhones have great cameras to film on, you don't need to start with a DSLR camera. I started my YouTube channel filming on my MacBook Pro and editing with iMovie. I hope my reply helped!