Guardian armor, how do we get pieces?

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The window on the left seems to put a lock on the armor, what does that do?
And the star piece at the bottom right is for?

The Star Piece on the bottom is an item you get either from daily roullet or you buy from Kiki in the sanctuary (Kiki is in charge of the store that sells everything for you guardian and craft equipment also) when you have that item and use it be warned that it could help you or not regarding your Guardian Status and your Cosmo, because as you well know, your guardian stats reflect on how much cosmo you have, so that item either increases or decreases your guardian stats .. its a gamble, i dont use it since i had real bad luck with that item and it took my cosmo a little down .. and as far as the left screen, like you said, it locks an item designated to the guardian, i made the mistake of locking a skill for a guardian and i couldnt equip the skill or throw it away, couldnt unlock it also, so be carefull on what you do there.

Hope this helps!   

How do you get the basic armor? The shop only sell blue and purple armor which need some sort of scrolls? The one Kiki gave me from quest is a green chest piece. I need a green helmet and green shoes.
And is getting 3 pieces of armor all that's needed to have my guardian wear it? Instead of the cloth box?

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What is this quest, and how to get the scrolls needed for the shop?

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* get all your secondary cloths to lvl 5 at least, get 6 lvl 79 assistants with 3 pieces of armor (at least that one we can buy with 3 scrolls )
* unlock all 4 skill slots of your assistant and equip lvl 6 skills on those
* try getting your lvl 79 assistants' power as close to the max as possible by using those stars . max is 2500, buts its random; anything 2200 ish is good enough

The scrolls are too expensive. How do we get the generic green tier armor, the one Kiki gives you a chest piece of?

Having 6 assistants, can you have them all equipped at once? Or will they take up inventory/warehouse space?

I'm only getting 3 yellow stones a day. Is there anyway to get more?