Need help setting up and rooting new LG G3

Hi,

Just bought a new LG G3. It has Android 4.4.2, Build version KVTL49L.VS98512B, Software version VS98512B.

I'd like to root it, and then install a custom ROM that will maintain root.

There are many root threads on this forum, but most appear not to work on my phone.

1. What is the best way to root 4.4.2? I assume I should not take an OTA upgrade?
2. Once rooted, can I install TWRP, and how?
3. Once those are done, what is the highest Android version custom ROM I can install that will maintain root?

Please don't say read the forum. I have, and it's total confusion.

Thanks in advance.

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