Funnily enough this is my best daily living skill . I’m not brilliant at it , but neither am I in debt. Some months I spend quite a lot , but other months I don’t .
I know however that money management can be problematic for many with mental illness .
That is a site for those in the UK . Perhaps others could post such sites for those in the USA,Australia etc .
Arrange for essentials like electric/gas/internet/phone/rent etc to be paid by direct debit(if not in the UK then your country’s equivalent) . If you have a credit card consider paying that in full also by direct debit(or equivalent) each month .