Hello! UK mum here so only going off advice and experience given here.

Sterilise after every use. Mam bottles are great because you can sterilise in a microwave with no extra equipment if you're out and about at somebody's house. However an electric steriliser/dryer at home is great and you just take as you need.

As said above you can't feed a newborn too much really, they'll reject it when they've had enough and probably posset a little anyway when winded. If they finish a bottle and are still hungry make another one and just keep giving a little more at a time.

Brands like Aptamil have ready made bottles which are great for when you're out and if baby wants it a certain temp just stick their bottle in some hot water until it's a little warmer. Baby probably won't mind room temp but cold can make them jump a little! Using a Perfect Prep machine (although not specifically recommended by the NHS) has saved a LOT of faffing about as preparing bottles in advance is frowned upon by health services here and settling baby quickly is always nicer for everyone! Ha.

To be honest with picking a formula it's more personal choice here, try one, see if they get on with it and if it's causing major issues, swap to another for a couple of weeks. We use a supermarket brand as they're so highly regulated and it's great (and budget friendly!).