My first home build

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Hey guys, I need some help. I'm building my first desktop and I'm at a standstill. I only need a power supply and water cooling kit and then to wire it all up.
Current build:
Motherboard ASrock killer 990fx
Processor AMD FX 8350 4ghz
RAM 32gb crucial 1866 (in four eights)
Case NZXT Noctis 450

I know I'm going to have to get at least a 1000w power supply because I am going to be adding a second r9 390 and a 360mm water cooler, but here are my questions

1. Which power supply should I use? which one is the best for long life and power efficiency, looking for around 250 max
2. Which 360mm water cooler should I use? Is a open kit suggested or should I get a factory sealed AOI? Not looking for "THE BEST EVER HOLY SHIT" but low maintenance, good performance, and preferably something I don't have to drain and refil every 6 months. It's not the most taxing thing ever but I'll just forget.

Keep in mind this is my first build and I'm kind of flying blind. I don't even know how to wire this shit, my friend is gonna do it and teach me how in the proccess