In addition to regularly monitoring your checking account, try to keep a buffer of cash in there to help prevent overdraft charges or even cancel the overdraft feature altogether (although you may run the risk of late fees from billers if you miss a payment duetoinsufficientfunds).
Consider the older executives starting businesses for the first time either out of necessity (due to layoffs or insufficientfundsto move into retirement) or out of the desire to fulfill a personal dream.