if you are looking for a good video editing software to make/edit and upload youtube videos, you can follow me to use Youtube Movie Maker, it can be used to edit/make and upload youtube videos from various videos, pictures, audios, musics, texts, lyrics, etc. and it provides many video edit features, such as join, cut, crop, mix, merge, add special effect, add motion/action, etc. with it you can easy to
create a video with voice overs(adjust the volume of the video and audio line, etc.), you can download it from makeyoutubevideo.com, and view below channel for some online guides, youtube.com/easymakevideo, hope it can help you.