If my husband hasn't filed in 10 years, should I go ahead&file married but seperate or should we get a professional to help? He hasn't made more than $30g/yr besides once

In 2017,he made $60g. I only make $20g/yr. We have 3 kids that I have claimed. We don't have any assets other than vehicles less than $10g each. We don't have any other income,we have no other accounts,nothing. Not sure how much he might owe but want to do it right. Any advice?