What issues need to get decided in a legal separation?
The same as those in divorce. The Court must divide up all the community property and debts the two of you have. That includes houses, businesses, bank accounts, retirements accounts, pensions, vehicles, stocks, credit card debts, other debts, etc. Spousal maintenance can also be awarded as part of the legal separation.
If you have children, the court must decide the custodial issues of legal decision-making and parenting as well as the issue of child support.