How to prepare for a divorce, advise please

The situation is as follows. I have been thinking about divorce for a long time. I did not dare before, because I was completely dependent on my husband, did not work, stayed at home with the children. Recently I went to work, put the children in kindergartens. I started a conversation with my husband about a divorce, asked what he was claiming financially, what alimony he would pay (if any). He claims for half of all our property and money, and even for my mother's money, presented to me and still lying in the stash (a decent amount). Alimony may be paid, maybe not - he will look at my behavior, he has no official salary at all, he works but all of his income is not official. To be honest, it was predictable, except that I hoped that he would not want to take my mother's money. We have a 2-room apartment, bought partly with the money we earned, and 30% with the money borrowed from my uncle , which we did not return. My husband wants 50% of the apartment, or rather a 1-room apartment in a good area, regardless of our debt. He said he would pay the debt himself, provided that my mother had problems with housing (it may arise, but this is a different story, but it may not). I do not believe in this (he is unlikely to be worried about the problems of my relatives after the divorce - this is an excuse for maintaining decency). This is the situation. How can I prepare for a divorce given including these initial conditions? I have read an article https://onlinedivorcer.com/blog/divorce-checklist-how-to-plan-your-divorce-properly and want to move on with my divorce. Probably, it is worth trying to give the money that is in the stash to my mother for safekeeping, or can I put it into my account with a savings bank? Now they are stored in the safe at my husband's at work, we decided to store them there when the relationship was far from the current one. So access there is also fraught with risk for me, but still theoretically I can take them away, I have the keys. I don't even count on the debt that we owe my uncle. The only thing that can be hoped for is that the court will divide the apartment, taking into account the fact that two children remain with me, i.e. not in half, but little hope. There is also such an option - to persuade the husband to give 1/3 of the apartment to the children. But he does not agree yet, and of course, when it comes to divorce, he will not agree. I believe that it is unlikely to happen, at least in order to persuade my husband - good reasons are needed, which I cannot find or can think of.