Unlike child support, spousal support is often very difficult (if not impossible) to modify after the divorce is final, so getting it right the first time is a must!
Chances are, since you have custody of your son, you won't have to pay alimony. And he will have income imputed to him (probably just minimum wage at 40 hours a week) and be ordered to pay you child support. Doesn't mean he will, but he will be ordered to pay something.
But that is something that you want to discuss with your attorney, which you already have done. And your attorney has told you not to worry about it.