I agree with Drew on the tax issues. Find yourself a tax pro now. Don't rely on your lawyer for that.
The 90 days may also include the time it takes for your lawyer to pay off bills from medical providers and experts.
As your lawyer if he is going to negotiate with the medical providers for a discount. Some do.
Also be aware of the possibility of an offer of a structured settlement where your settlement is paid out in monthly or yearly increments. That's not necessarily a bad thing but it saves the other side a ton of money because they buy an annuity for a fraction of the settlement and the annuity company pays you the increments.
Might be some tax advantage to you do go that route. Talk to a tax pro about it.
If you decide to go that route don't do it unless your attorney agrees (in writing) to collect his percentage out of the payments. Otherwise you'll be paying the attorney with the payments and you'll see nothing until he's paid off.