When you are trying to start/run an online business, how what are some ways to keep on top of things? Organisation strategies etc?

I have seperate emails for my biz stuff, but if things are starting off slow, is there a way to set up a notification thing so an alert or something will let you know if a customer bought something or is asking a question etc?

I know this is probably the most noob question ever, but anyone got any life hacks for this?