Child support is the right of a child. You will receive child support prior to the divorce. However, in order to receive child support you must petition the court. As far as dividing your belongings, it depends if he wants his personal belongings or to divide marital belongings. You should contact a lawyer to understand divorce process.
File for child support. Start a divorce case to protect your assets.
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Since you have legally separated you now have three options, you can initiate a divorce action or file a petition for support under the FD non dissolution docket, or you can make a deal between the two of you. I understand that he has been promising some amount for support, but has not come through on that promise. I would say your best bet is to file for divorce if that is what your final intention is or at least file for support under the non dissolution docket, which will in the interim get you court ordered support, but you would not have initiated a divorce proceeding.
As for the personal property in the former marital residence, the more you can agree on now and divide, the less complicated it will be later when tensions and emotions are flaring because of a divorce action. However, besides his clothes and personal items, he will not be allowed to take anything else if you file for divorce.