Hi Elisa, wow that's a long hello! Nice to have you here. We will sort you out as we go but I can't address all your issues right away. You will slowly find stuff on my existing lesson videos and more on the upcoming ones here soon.
As far as being consistant that will come as you spend more hours with your horn. Your embouchure will strengthen thus giving you a stronger sound and as you practice you riffs and scale exercises your fingers will get faster (the don't really because it's all in your brain).
There is a solid lesson on proper breathing here so you should get some help there but as far as the dent in the neck, this is very bad as even the slightest one will hamper your playing. The neck is very important and a dent there can really mess things up as it is on the beginning of the sax, whereas a dent on the bell wouldn't matter at all. You should get it looked at. I've had to replace necks because of dents, although I don't know how serious yours really is.
cheers
Johnny
