Adding subtitles and music

I have recently added subtitles to my video, but it is not as good as i want it to be because you are unable to change the font of the text, only its colour and position on the scree, without a software designed for the purpose of subtitles. Due to my current financial status, I will not be able to pay for this.

Additionally, I have also added music as a backing track for the video in order to set a dramatised effect on the video. With regards to the music, not only did I add music, I learned how to edit it. Cutting at different sections lowering the decibels of each section I cut to overall produce a fade in music. I have linked the backing track to the video so that a different scene would occur at different beats. Especially at the beginning when the music has a fast paced beat, the video would be adjusted to match.