As part of the tax overhaul passed last year, a major change is coming to alimony. Effective January 1, 2019, alimony in all newly granted divorces will be taxable to the paying party, rather than the receiving party.
One of the more fundamental aspects of day-to-day life that's impacted by divorce, is where you and your spouse will live, both during and after the divorce. Ideally, you can figure out where you'll live after the divorce early on in the process, and use that decision to guide you earlier on.
Extracurricular activities can be fairly minimal, or can be thousands of dollars per year, per child - especially if the word "travel" is involved. Because the costs are usually on the low end for younger children, parents often don't consider the costs at the time of separation, but only when they've reached their full, teenage levels.
There are two issues surrounding where a case will be filed - jurisdiction and venue. There is a course in law school dedicated almost entirely to these issues (civil procedure), so unfortunately I can't give a comprehensive answer to the question that suits every situation. The general rule is that cases must be filed in the state and county where the person you're filing against lives, but divorce and family law have more exceptions to that rule than probably any other area of law.
Often a house may be in only one person's name instead of both. If so, know that how the house is titled is not controlling in a divorce. Regardless of how the house is titled, it will be handled the same way in the divorce, and just like everything else - as a division of marital property.
This is where you have to take a step back and assess your goals. You can hold out for the best financial terms possible, or you can reach an agreement sooner than later, but it's not usually possible to do both.