Not an expert, so just going by my experience..
They like consistency, when we decided to get ours my wife was off work for a few weeks so had time to bond and gain trust. I know it's not always possible but if you can take a little time off to start with it might help. Oh and play, and I mean until your arm is sore from waving the fish on the stick or throwing the toy mouse for fetch (yes, some play fetch!). They love that interaction, even if it means rsi for you
Also might be worth considering some 'behaviour spray' to help keep them calm. I used it when we moved house and it helped.
Food, read the forums full of opinions. My take, we leave dry food out in the day plus half a pouch of wet food in the morning and early evening (all good quality, check with vet / forums). Also most days gets some raw meat from whatever meal is being cooked, never any cured meat though (ok, maybe the odd little treat
) Being bony, first port of call is vet. However ours is about 8 months and very lean (long and slender) perfectly healthy. One of his half brothers who someone we know has got is a bit more stocky, some just stay a bit more true to their roots.
Noise, I would say ours seems to have a heightened sense with certain noises compared to other cats. They'll get used to the environment in time though. We moved house recently and you can hear ducks / geese in the morning over in the country park, he went mad every morning for the first week. Car engines and lawnmowers seemed to stress him a bit, but again he's more used to it.
Most importantly, enjoy them... they are so much fun and entertainment. Watched K2 stalking a daddy longlegs for half an hour last night! One of my mates who's a 'dog person' said our little man could easily convert him!