looking to go into childminding

[charlotte1001]

Hi there,
Ive been looking into going into childminding and wanted to be available mon-fri 9-3 so im looking at taking on children 3-5 years (older children will be at school, younger children means not so many children) however doing some research shows the ratio is 1:3 3-5 years on this note i dont see how it is possible to use this as an income? and so wondered how so many people do it?
Any advice would be much appreciate
Many thanks