1| If your fan header is 4 pin and with true PWM control then you should have a 4-Pin PWM fan to take advantage of it. Most fan headers on the board may be 4 pin but they aren't true PWM fan headers. In most cases you can also set if you'd like the fan header to be voltage controlled or PWM controlled.
2| Yes it's 6x 4pin fan header's
3| If you want to control all your fans with a simple click or two, might want to invest in a PWM fan splitter/hub like the Swiftech 8-way PWM splitter
or the Akasa FP5
4| What fan hub are you working with now?
Thanks for the reply
The NZXT H440 case has a little fan hub in the back, but doesn't look very sophisticated.
I might be getting the NZXT S340 Elite case instead though, still deciding.
I would just like to be able to control the fan speed of 2-5 fans without having to go into BIOS (don't have much experience there), would I be able to do that without a fan hub (so by just connecting the fans to my mobo fan connectors?)
Thanks in advance