Sneaker: Sorry you got walked into it this way.
Its a lot of info to try to wrap your brain around, I started with the Lee setup you have.
It does work sort of, I started with 44 magnum and due to its much larger case, its forgiving of error. 9 mm is less so with a smaller case and the high pressure but it will work.
Unclenick is a great resource but he gets pretty technical pretty quick. ergh you say.
Harder for a full beginner to grab all he is conveying.
Most 9mm is fine for reloading. Some that was not was mentioned. I learned something new myself, I didn't know there were 9mm reduced volume cases, not sure what that is about but will find out (I am sure!)
As Unclenick noted, you do have to use the scoops with the listed powder and the right scoop. 3 to 6 grains isn't a lot of powder.
What I did find was the cases did crack after about 3 rounds with the Lee, I believe it was the hammering. Not sure that has changed, I am wracking my brain back to the early 70s sometime here.
Do read the manual with the loader, its really good to have the general idea.
The one device you pound the shell into sizes the case.
I can't remember if there was a flare tool (opens up the mouth to let the bullet go in easier but just a bit and at the top)
Once the case is de-primmer (if used brass) and sized then you have to flare it, primer it and then ready for powder.
Forget what the bullet seater is like.
What I would do is disassemble your pistol (assumes its a semi auto) and see how your bullet fits in the chamber.
Thats a tough one, I don't know that that set comes with an overall length gauge.
If the bullet is too far out, it will push the case back and it won't be chambered right.
If the firing pin will release thats bad news. As to how it looks with a bare barrel thats a bit 9mm gun specific so a post of where its sitting helps. Been a while since I did one.
Hope that helps,