[Q] t100s: various advices

hi all, i'm alex!
yesterday, i received this device: THL T100s.
I never used android, so i am a very noob!

My phone is aready rooted, but with cinese app (icon is blue with a white anchor) !!

I have installed ROM Manager v5.5.3.7 to try it, but i have a lot of fear, i don't know what to do.
In ve "recovery setup" i can read this:
"recovery actual: Team Win"
"recovery project (TWRP).

What is the first step that i must to do?

backup, nandroid, etc etc? i don't want to become my phone a brick!

in the future, i would upgrade it, on needrom there are new rom updated.

Tnx so much to all, sorry for bad english and for NOOOOOOOOOOB!

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