hi tuttsy and welcome to the zone.
firsty i will ask what date's are you go july, august?
i'm going to thredbo and if i go before you i will give you all the goss .i have not been to thredbo for i few years so i not sure on where to get cheap food.
but i will help out as much as i can ,just keep asking the question even if you think its a dumb question do worry we will help out .
firstly its going to cost you alot of money ,but you will love it ,and you might think its going to cost $2000 or so ,but i wont it will cost you $20,000
because once you kids ski or board they will want to go every year.lol.
i would hire all your gear on the mountain ,like parkes and pants and skis or boards, because if the skis brake or the boots are to small you can change them in 5minutes on the mountain ,and you will get them cheaper with a clothes and skis package .
all you need to take TO SKI is beanie's and long socks, glasses and gloves you can hire the rest.
plus take warm clothes for walking around when your no skiing.
lift tickets you have they are 5 days of 2hr lesson's in a group,that meens at around 9am the boys will have lesson every day for 2hrs and then they can ski or board thredbo after the lesson and practic what they have been told ,they can ski all the mountain on that ticket ,when they get good at it.
as for chains you can hire them in jindy just before you drive up to thredbo .around $40 dollars for the week.