Help with my New LG g3 As985

So i recently purchased the Lg G3 on Ebay because it was on sale and it seem like a good deal...............anyway ive had lots of phones from iphones to androids, i always love to root my devices now the issue now is that i cant seem to find a way to root this g3 with the one click root method or any other method (expect Kingroot). Everytime i try the one click root or any root it does all the loading and process and reboots but no super su or root happens. I finally looked around and found a post that said to use kingroot and i did and it worked, but the reason i want to root my device is to flash other roms and tinker with other things and i dont know how to do that without a recovery menu like twrp. I have the LG G3 AS985 which has literally no support anywhere when it comes to rooting or anything. So if i can get someone that knows either how to root it with one click or with kingroot and have the recovery work with it OR if he can at least show me how i can do it without a recovery meaning flash roms and stuff without a recovery using kingroot . (im a noob sorry) or if i can at least upgrade to marshmallow to have something a little nicer anyway any help would be great.

sidenote: i heard that i may be able to use the vs985 recovery with the as985 but i really dont want to brick my phone. Again im a noob so go easy on me pls.
Tried to post link but im a new user so here is the phone

Phone: LG G3 AS985
Firmware: 5.0.1

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