What is the best order of operation?

I am trying to improve the sound on a video. The levels vary greatly and I was wondering what effects to use in what order. The video is almost 2 hours long and can be seen at http://justforfunsingers.com/videos/judysmemorial.mp4. About 1 hour and 1 minute into the video their is a clarinet that is pretty overbearing and I am not sure of the best way of correcting it. Maybe equalization if I could tell what frequencies to tone down. About 1 hour and 15 minutes into the video their is a little girl speaking that is very soft spoken. I need to amplify her. I would like to normalize the whole video along with removing noise. What is the best order of operation to get the best results and what else could I do to improve the sound and still have it match up with the video? Thank you.

Most of that recording sounds quite well balanced, so personally I’d avoid processing the entire thing, other than perhaps a little “dynamic range compression” (https://manual.audacityteam.org/man/compressor.html)

If you are listening on computer speakers, the clarinet will probably sound much louder than it really is.

If, after compression, the little girl’s voice is still very quiet, you could use the envelope tool (https://manual.audacityteam.org/man/envelope_tool.html) to bring up that bit, but take care to not overdo it or there will be a noticeable and distracting change (increase) in the background noise level.

Thank you for your response. I will read up on compression and envelope and test them out.

I forgot to mention that I am using Linux Mint 18.1 and Audacity 2.1.2 until after I had submitted my question and then I could not get back to it to add it in until it had been posted.