Information about live chat

Hello, I'm Henry, and I'm involved in offering automatic driving lessons through my website. To further improve the quality of service for my customers, I'm looking to integrate a live chat feature. However, I'm unsure about the process of adding this functionality to my site and the associated costs. I would greatly appreciate guidance on how to develop and implement live chat effectively, as well as an estimate of the budget required for this enhancement. Thank you for your assistance!