first of all congratulations with the step you took ! it takes great courage to break away from the shackles of society, so well done !!!
that said you are now in a position where you have to rely on your own ingenuity and resources.
in an ideal world you would indeed build things right from the first time but I guess that is not an option !
your main goal is to keep the spirit alive not only yours but also your families !
I have lived rough many times in my life and I find I can cope with a lot and live very basic but certain things you can t go without.
first priority in my opinion is get yourself and your family dry ! don t spend to much time or money on it, a tent is a good place to start from but not a place to stay in the winter months
some corrugated metal roofing is not hugely expensive but does the job ! ( with you intending to harvest the wood on your property for heating you really need a chainsaw !!! you can start by making a rudimentary construction with trees harvested from your property(building always takes more time and money then you had planned for !!!), and if I were you I d already fell some trees and cut them up for firewood in the coming winter !!! you need wood and preferably dry !! it takes time to dry out !!
that brings me to the second priority --> warmth, do not underestimate what it does to the spirit when you are cold !! or what warmth can do to lift up the spirit after a hard days labour in the rain !!
so prepare wood for winter months --> and some kind of wood oven, heat from wood makes the climate indoors dry a gas burner gives you heat but everything gets moist inside, moist clothes is a no go for comfortable living.
third priority is food. make sure the process of making food is not to cumbersome like it is now ie you can t cook when it s raining! you can sleep in a kitchen but you can t cook in a bedroom !
if the process of making food is to much of a hassle you ll tend to skip meals, further depleting the spirit !!!
fourth priority and especially with wife and children is toilet and personal hygiene, it can be very hard for woman to live like that so don t underestimate that "luxury "
you might want to check out some public pools or gyms where you can go and take a bath
it really refreshes the souls to be able to take a nice long hot shower !!
so my overall advice would be make sure everybody stays in good spirit !!! that is very important
and accept to build things twice like that you ll make mistakes the first time and you ll know how to build it better the next time
take a very good care and I truly hope you ll succeed !!