I’ve Got A Chat Tomorrow for My First Gig As A Freelance Front-End Developer

Hello! So I'm a new front-end developer with no commercial experience so I thought I'd join Fiverr in order to gain real world experience. Someone contacted me today wanting a landing page and website for their online food delivery business. What's the best way I can prepare for this chat? How much should I be charging for this? There will likely be back-end development involved in this so should I outsource that part? Is it okay to take some time after the chat and then get back to him with a price?