I have some Cockatiel Questions?

I just got my cockatiel today, and I read a lot about care and stuff, but I still need help. Hes about 5 months old.

What does it mean when my cockatiel…
-fluffs up it’s feathers?
he’s fluffing up his feathers a lot lately. I just got him today.
-he hisses?
I know it mean hes threatened, but should I still try and touch him? or should I stay away? Sometimes he hisses when I’m near the cage. Sometimes he’ll be completely content with me petting him, then he’ll start hissing.
-he tilts his head to the side?
it probably means nothing, but I’m just curious.
-he squeaks.
sometimes, he makes a small noise, and sometimes he makes a louder noise.
-he stays on one side of the cage.
it might be because my bed is on the other side of the cage.
-he goes in the corner.

Questions.
-how come hes not playing with his toy?
I got him a toy, and hes completely steering clear of it. He is right next to my bed, and the toy is on my side, so that might be a reason.
-he hasn’t touched his food yet.
I’ve been hand feeding him a little, but its really not enough to fill him. I put a piece of banana in his dish, and a strawberry, but he hasn’t even nibbled them. He hasn’t drunken anything either. It might be because he has to get used to his surroundings, but I’m not sure.
-how do I know, if putting my hand in the cage is doing anything?
people are telling me to put my hand in the cage for 10 minutes, to get him used to me, but I don’t know if thats doing anything.

Please please please answer! I can use all the help I can get.
Any other cockatiel advice is welcome!
- Katie

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have been offered a cockateil and cage for £60 is that cheap?

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