Practice Better Calendar Integration

I need to install an online booking page with a calendar of availability. The first step will be confirming whether my account is correctly activated—right now I’m not actually sure—so you may need to guide me through that initial check or set-up before we touch anything else... (Budget: $250 - $750 USD, Jobs: API Integration, Email Marketing, Graphic Design, HTML, Payment Processing, PHP, Web Development, Website Design)