Women's Aid can help you given your marriage sounds financially abusive.
Post on Legal here on Mumsnet as there are several family law solicitors who can advise you on what to do next.
And I'd report your first post to Mumsnet and ask them to move it to Relationships, as Am I Being Unreasonable tends to be a bit of a fight club, and Relationships more supportive (though do ignore the odd All Men Are Always Right And All Women Are Harpies bloke who pops up to spew bile on general principle, because women supporting one another can't possibly be allowed. Ignore, ignore, basically.)
The starting point of division is 50/50: property, savings, pension, the lot, though that's a starting point and various factors (length of marriage, any special needs of one party, whether there are dependent kids who need housing, and a few other possibilities) can affect the precise division. Pension and family home are usually the biggest assets. If you have dependent kids and are primary carer then the courts try to keep them in their home if at all possible until 18, when it's sold and the equity split - a Mesher order (though they aren't best in all situations). Spousal maintenance is rare these days, because a clean break and independence is seen as better for both, but if you've been a housekeeper all your life then a period of such maintenance to enable you to adjust and train for some sort of work is possible, perhaps even likely, though you'd need to ask a specialist family law solicitor. The spousal maintenance provisions have largely fallen by the wayside because most women work outside the home and thus enable a clean break, and tbh I think you really would benefit hugely if you did start to build your own work history, if you've not already got one. You'd have your own money, your own circle of friends, your own interests and sense of achievement - work is about so much more than a way to put food on the table. Work is power, freedom and maturity, all in one. You've been denied, it sounds like, for much too long.
What are your interests - what do you find gets you thinking, energised, curious, engaged? What do you like for you, you the individual, not you the adjunct sidekick of some bloke?