1) I would NOT hire an attorney unless you really don't know anything about anything. That's just a good way to make some of your money go away.
2) Let's assume you end up with $3.2 million after taxes. If you put that in a mutual fund made up of 50% bonds and 50% stocks (you should be conservative) and take just 4% of that total, that is $128,000 annually. I'd do that and then over the next year use that extra income to get rid of the credit card bills.
3) Now you're left with student loans and the mortgage. I'm ok with it if you want to pay them both off quickly, but the rate on the house isn't bad, so if you want to keep that for a while (perhaps until the student loans are gone), then fine.
IF you both loved your jobs, I'd tell you to pay the house off and all of your debts and bank what was left, work for a few more years and then retire. BUT, you hate your jobs.
One thing you could do now though is quit those jobs you hate and find fun jobs to do for a while.
Now, me, I'd retire for good, but that's me.
What you shouldn't do is go buy some big honkin' house with huge taxes and nice cars and other crap...$3 million can go quickly.
Congrats, and have fun.