The usual legal advice is not to move out of the former matrimonial home until there are arrangements for the finances and children in place, unless it's unsafe to remain there.
Depending what is in the bank account and the size of the overdraft facility closing the bank account may be of little consequence if you have your own account. However, if your name is not on the deeds to the house you, or a solicitor on your behalf, will need to register your matrimonial home rights with the Land Registry in order to prevent the house being sold until proper arrangements are in place.
All the value of assets (including pensions) held jointly and solely, minus any liabilities, form the net value of assets under consideration. The assets are then shared according to a checklist of factors and usually meeting the needs of both parties is at the top of the list.
A good starting point is to think about both parties' housing requirements and how much equity could be made available, local house prices, how what mortgage both parties can raise etc. Strictly speaking the starting point isn't sharing assets 50:50 - equality is the 'yardstick' to measure settlements against, but that isn't necessarily 50:50. For example, a lower earner cannot raise as large a mortgage as the higher earner and therefore requires more capital to be on an equal footing to start independent life.
Although the welfare of under 18s is the priority, children over 18 in education or special circumstances are not irrelevant and courts recognise they need a base even if they don't live there full time.
It usually takes months or even years to sort matters and apart from seeing a solicitor to find out where you stand and what your options are I would suggest that it would be worth not trying to tackle direct negotiations with your husband whilst emotions are running high. Emotion just hurts the wallet.
Legal fees can make a big dent in your assets and once the first part of the divorce goes through if you can come to an agreement between yourselves or with the help of a mediator a solicitor can draft it into an order which is legally binding once ratified by the courts.
Alternatively, some people use collaborative law when both parties and their solicitors have a series of meetings to negotiate a settlement. The solicitors agree to withdraw if no settlement can be reached so it's not in their interest to not reach a settlement (sorry, double negative!) Collaborative law isn't cheap, although it's cheaper than fighting all the way through the courts and the main advantage is that it does the least damage to long term family relationships.