If he doesn't work then he doesn't have $1000 per month. That is fact. He will not give the money. I would say you need to file separation papers and get full custody, then go for child support. He needs to help support his son. If he is not working then they will set minimum wage child support on him. It is less than $200 per month.
If he has a huge income on his tax papers though they will assign him more.
So, even if he is not working they will assign him some, not near as much as you need for your living expenses.
You both need to decide what it is you want out of this separation. Is it time for you both to get used to filing for divorce? Is it time for him to have a wake up call, get on the right track, then perhaps get back to working on your relationship? What is the purpose of the separation?
If it is to eventually file for divorce then you need to think in lines of division of property, he would get half the house sales proceeds. I would not do anything official until you have asked an attorney what legal options you have.
IF
The attorney may tell you that he is half owner and can support or totally block the sale of the property for years.
The attorney may tell you to move away and let him take over the house. You will want you make sure your name is off it so when hubby lets it get repossessed it won't be on your credit score.
An attorney may also tell you exactly what hubby's legal responsibilities are in a legal separation.
There are tons of questions that can come up but an attorney who is knowledgeable of divorce and separation will be your best Ali.
Do NOT expect everything to go your way. You will have to work full time and be able to fully support your children on your own and not be dependent on hubby for anything financial. Or he may be able to get full custody. It is happening more and more nowadays.