\"Deprivation of income\" money in children's trust

Hi miss am totally new to all of this. I am in process of separation a leading to divorce. There will be money left from sale of house. I need to completely set up a new home (rented) for myself and two children. I will also need to buy a car as I live in a rural area and have physical health issues. This was never my plan - and the equity in our house was always meant to be a nest egg for our children. Am I allowed to put any of the settlement into their trust funds which can only be accessed by them when they turn 18 - or is that seen as deprivation of income for benefits purposes ? What legally am I allowed to spend money on that will not be seen as deprivation of income. Citizens advice have advised me to keep receipts for everything and asking as they can be justified as reasonable and necessary throughout this procedure then I should be ok. But it still worries me greatly
Also - I will need to set up my home prior to our own house being sold - so everything I buy will need to go on credit cards - to be paid off when settlement comes through. This scares me too.
Thanks