I’m gonna throw this suggestion in here, HitFilm 4 Express is a semi-professional level editor, almost comparable to Sony Vegas or Adobe Premier, I say almost because it does lack a few features, but it does have the necessities, multiple timelines, masking, frame exportation and moving tracks. It also comes bundled with quite a few stock special effects that aren’t in the other programs. There are a few short comings however, you are limited the formats you can output to (MP4, AVI and GIF) and some visual effect you would think would be standard are behind a pay wall.
There is also a paid version but if you want to dump money into editing software, I would recommend going with one of the big 2 (Premiere or Vegas). I would generally only recommend HitFilm to people who are just dipping their toes into the pool of editing with out diving into the cost sea.
Two other things unrelated to Hitfilm, I second getting a XLR microphone, I’ve been using a AudioTechnica AT2035 Condensor Mic run through a Behringer U-PHORIA UM2 audio interface for the past year or so for my streams and voice acting endeavors, and it sounds wonderful, the initial price may be a little steep when first buying in but it is so worth it.
Last thing, please learn to use the noise removal effect in audacity or audition, it one of the most useful audio related things I’ve ever learned.