Hardware Issues for Ethereum Mining

Hello, I have no prior experience of Mining for Ethereum, i have mined before for bitcoin with Antminer, and those Antminers are very noisy and get

too hot. I have Power Supply 750 W ,

here link : https://www.amazon.com/gp/product/B00KFAFRW6/ref=oh_aui_detailpage_o05_s00?ie=UTF8&psc=1

I have several questions for the hardware i need to mine for ethereum.

I want to start with one GPU to see how it is working...and add more later to build up the rig.

I found the link here of how to build a rig with all its components, here : https://blog.simpleblend.net/building-an-ethereum-mining-rig/

However, i i still have some questions. Can i use the power supply i have, how many GPU's i can supply with 750 W ?

Is it noisy GPU mining? Can one sleep in the same room while it is working or just simply can one just do other things while it is working, since when

i turn antminer on, it is so noisy that i cannot even do reading and it is too difficult to concentrate.

How hot GPU rig gets? Do i need a fan right next to it ? What is the latest GPU i should get for the best rate power?

Will I be able to run rig of 6 GPU's without tripping the electrical breaker in the apartment, since i was told that i can only run one S9 Antminer ?

Does water-cooled GPU's are less noisy ? Are they more expensive?

Possibly i have more questions, we can discuss as we go alone, thanks in advance... get back.