General questions about android

I'm new on android and I need some help....
I haven't understand what is rooting and if I have to do that to my phone.
I have a chinese smartphone that instead of the company logo or the manufacturer name, it only has the Android badge. That means I do not know the model of my phone - from the info inside the phone it says "s5". I assume it is a clone smartphone, but it doesn't look like the samsung galaxy s5... So how do I find a tutorial on rooting?
Another thing I'd like to ask is the following: If ram is full, that makes it impossible to run the applications on the sd card?
I feel a bit lost and it would be great to have some answers...
Thanks in advance!
Anna

(sorry for my spelling and grammar mistakes, not my native language)

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