In no particular order; to raise the levels you can 1)normalize the clips 2) use a volume envelope and set point to adjust the levels 3) set the clips that are “low” on a seperate track and adjust the levels with a bus 4) raise the “amplitude modulation OR volume levels in Non Real Time FX. I probably missed a couple but you might find you need to use more than 1 thing to get it right. Start with Normalization and see where you go. YOu can always go back to the original take.
As for removing background noise, well, that makes the cheese more binding. It depends on the noise; the level, the frequency, where the noise is in relation to the voice, I could go on but I think you get the idea.
Here’s what I would start with if you don’t have a NR program. I would take 1 clip go to Non real time FX goto TRACK EQ and pull #1 down and right until the voice starts to change then back off, then goto #2 and pull down and to the LEFT a bit to even it out. See how it sounds and if need be add some graphic EQ to put a bit of base back into it. Remember anytime you do anything to audio you most often change something else (sometimes not for the good) but play away because you can always go back to the original.
Don