Former family law MD. Anne Arundel YWCA may be able to help. Also try contact MSBA MD state bar assoc. for the person responsible for solo practitioners. A solo can work with you on cost. Just post attorneys name first. I had 1 opposing counsel really mess up his client and if you ask our opinion on him I will tell you skip it.
Your ex can forget it. He will pay court calculated support or go directly to jail.
Keep track of your expenses (diapers, cotton balls, day care, nipples)
If you have his info (SSN) helps
Same for the tax info (support is based on his income)
Know his banks?
Don't violate the law to get this stuff
Also don't tell him what your are doing
Also contact your local court to file the support process
It is due from the day you file