You will generally get paid by the minute, and working for an adult chatline, the rate per minute usually increases the longer you keep the caller online.
As with anything related to earning from home, there are a lot of scams out there so be extra careful of anyone that asks for money up front as 'set up' or 'registration' fees.
You will also need to record messages to be used when you are offline.
A sexy chat on the phone that you may consider fun on a one-off basis with a friend or partner, can quickly become boring and unpleasant when you work as a sex chat line operator and have to keep talking for hours to men you don't know!
Most popular hours for customers to call phone sex chat line jobs are late evening to the early hours of the morning, so it can fit well around a day job, other part-time work or family commitments.
Many adult chatline operators set up a fictional persona which they use when they are chatting - they make a 'backstory' they can refer to.