#1
I play a lot of metal music and from what I see here a boost pedal is a good thing to have. I just don't really understand what it does :P. I didn't buy a new amp just to use the distortion from some pedal, but it seems like it just increases the gain of the amp a little bit. Is that right? Or is it in fact the pedal's sound?

Seen some recommendations for the Ibanez TS-9, any other suggestions?

And then I would need a good noise gate , what should I get. Budget isn't huge also, just bought the new amp lol.
#3
^this,
And exactly what is your budget?
Guitars:
Gibson Les Paul Standard
Gibson Explorer New Century
Gibson RD Artist
Fender American Standard Telecaster

Amps:

Framus Cobra
Marshall JCM800 2203 - 1960A

Pedals:

Crybaby 535Q
Rockbox Boiling Point Overdrive