Editing:
It's best to plan your shots BEFORE you film. Here is a link to key cuts that you should plan ahead of time:
Sound and Audio Normalizing:
Remember that sound is 30 to 50% of your film
Listen to each clip carefully (ideally with speakers) and use the audio level meters. Your audio should be just below the yellow (in the -18 to -6 Db level)
can you distinctively hear all conversation? (if not, adjust)
Are your voice levels similar throughout? (adjust accordingly - louder talking/yelling should be louder)
Does your music overpower your voice? (lower music volume)
Does the background "noise" transition naturally from shot to shot? *this is often overlooked
Do your sound effects work convincingly and are they lined up perfectly? (make adjustments - including levels)
Is music used to add emotion to your film?
Are all of your music and sound effect clips "Creative Commons" or "Open Source" and documented?
Colour Grading:
Once you have completed your draft, use colour grading on your clips to more effectively set the mood of your film.
Find a free "LUTs" file that you can use.
Work through the basics of colour grading in Adobe Premiere
You can also colour grade yourself and then create a LUTs which can be applied to your other clips
Did you shoot in C-Log or other flat log format? Use Adobe's auto detection shown in this video