HaWho - Absolutely get your own lawyer. I don't know about your jurisdiction but here for a separation agreement to be binding each party needs to have independent legal representation.
It's a bit sneaky but you may want to consider getting a credit report done on him as well to keep under your hat.
One thing to think about as well is custody schedules etc plus the boy's futures. It's not a given but having it in the agreement about college and related expenses would be a good bit of foresight.
On BD H52, W50 T27, M26 S21, D23 BD-9-Mar-16 D-15-Jan-18 Final-19-Apr-18 I am a storyteller. The story may do you no good. But a story is never for the listener. It is always for the one who tells