Assistance with the actually building of the computer, fan set up

Hello All, I am quite the noobie and am in the middle of my first build. I have all the parts and am in the middle of putting it together and appear to have hit a roadblock with the fan connections and could use some assistance.

Set up:

Case: CM 690

http://www.coolermaster.com/product.php?product_id=2908

MOBO: Gigabyte GA-MA790GPT-UD3H

http://www.gigabyte.us/Products/Motherboard/Products_Ov...

PSU: Antec EarthWatts EA650 650W

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I would like to set up the three stock fans to the MOBO.

The MOBO has 4-pin CPU fan header (CPU_FAN), a 3-pin (SYS_FAN2) and a 4-pin (SYS_FAN1) system fan headers, and a 3-pin power fan header (PWR_FAN) and a North Bridge Fan Header.

The CM 690 has three stock fans that all have 3-pin connectors as well as molex adapters.

Basically, how do I connect the fans? The rear fan will only reach the NB fan header and all the fans have 3-pin connectors. So what would I connect to the 4-pin sys fan header and what about the PWR fan? Should I be connecting any of the fans to the PSU instead of the MOBO? Is there a fan connection on the PSU to the MOBO?

I know this are probably pretty simple questions, but this is my very first build and apparently I didn't know quite as much as I thought so any info or guidance on this would be great, I have been looking online for a while and really haven't been able to find specific answers.