Give me some tips for my LG G3 (F-400L)(CloudyG3)

LG G3 (F-400L)
Hi can anyone help me?(NEWBIE)

First of all Sorry for my ENGLISH GRAMMAR

I'm using right now a 2nd hand phone,
and i didn't know that its using a custom rom (Cloudy G3)
so i don't know what should i do first because i want to flash a new rom
for my phone.I know how to flash a rom but i don't know where to start because
im in a custom rom and i don't know where to start

what is the 1st step should i make before flashing a rom?:confused:
the recovery but i don't know how to flash a rom on this phone
so can anyone give me a detailed steps for
flashing a rom for my g3?(while im in a custom rom)

And what is this aroma installer?:confused:

Hope anyone can help me :) :) :) :) :) :) :)

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