On the figures you have provided, you would be roughly* entitled to a One Parent Family Payment and FIS. Your one parent family payment (OPFP) entitlement is €150.80 (means test is €307 - €146.5 disregard = €160.5/2 to assess means = €80.25 and so the OPFP equates to €121 (€196 personal rate + €29.80 child dependent rate).
*I say roughly because your €307 income should be assessed minus PRSI, Union Dues and Pension Contribution.
Your FIS entitlment is (roughly*) €28.92 being €506 (income limit for one child) minus income of €307 (*minus income levy, superann, prsi, tax) and €150.80 = €48.20 x 60% = €28.92
So your household income will be €486.72 i.e €307 + €28.92 + €150.80(income + FIS + OPFP)
You should also look at a medical card entitlement. If you qualify for a medical card, you will not have to pay income levy - bonus!
HTH, A