1 yr old Sun Conure new to the house-Advice please

Question:
 We have never had birds before so we are very new to this. We got Francisco 2 days ago. He is about a year old and was very sweet at the store (obviously that was his home and he was comfortable there). We walked around with him for over an hour before taking him home. Any advise on how to help him adjust or how we should act to help him get used to us? In the home is me, my husband out our 2 boys (ages 7 & 8) and no other pets. He has a nice big cage and new toys and the same food he was on in the oet store. The first day he was very loud (to be expected) but he would let us hold him and was amiable. He will perch on our fingers and shoulders. Yesterday he was much quieter. Seems to be comfortable in the new cage, but is more reluctant to perch on our fingers and come out. He was very used to being petted (as long as we approached him slowly and he could see your hand and know what you were doing with it) and now he is very nervous about being touched. We let him sleep his 12 hours and cover the cage when he does. We have read as much as we can find but what does it mean when he fluffes up his feathers? And when I pet his tummy once he closed his eyes and seemed to like it, but he wont let me do it anymore. And does he get cold? Sometimes it looks like he is shaking, noticable at hit tail and the feathers by his feet. Should I take him out of the cage more? Or am I upsetting him? I want to be a good caretaker for him so any and all suggestions are welcome, please.
Answer:
 Fluffing could either be a sign of stress or illness. I would actually suggest seeing a vet if this is persistent and continues. As far as food goes if he is on a seed diet then you should switch to a pellet such as Zupreem. Seeds are fatty. Handle your bird as much as you can. Sit by his cage, talk to him a lot, be around him a lot. He is most likely just stressed from the move. He is nervous about being in a new place and he needs reassurance. Conures are incredibly smart so if you miss a day of taking him out he will hold a grudge so try to let him out everyday. One thing I did for my old cockatiel was I would just leave his door open and let him climb around the outside of the cage and mingle around the house for a bit. He loved being able to come out, it made him feel free. Best of luck!
Answer:
 Thanks, he probably stressed then, poor little guy! He is on a mixture of pellets and seeds and fruit/vegetable peices. Its a package of Kaytee conure food. I also give him apples (no seeds) and bread peices. Trying to see what he likes. He started nipping at us yesterday. When he doesnt want to come out of teh cage he bites, but not really hard enough to do damage. Daddy puts him in a towel and gets him out anyway (so he will see that he wont get his way by biting) and tells him "no biting" sternly. Then I usually get him and he stays on my shoulder for awhile. This has only happened twice though. His cage is in the front room where everyone is for most of the day and I talk to him whenever I come in the room. I ordered some sun conure books and a parrot book betcsbirds recommended to some one else with a new conure. When Im gone should I leave a radio on or something for him? Anything else you can think of will be helpful to me, Im a sponge-let me soak up your info!