[How much is too much?]

I have had some goldfish in a small pond for about a year. Found out they were breeding so urgently googled what to do  put female and couple of smaller males in paddling pool  with water plants to save some eggs. About 2- 3 weeks old now. Brought some inside but struggling to keep water I  small bowl clean. Think overfeeding.  Not using aeration or filter. Got a bit of gear but not sure how to set up. Can anyone offer help. Thanks linda