Calendar system to integrate to website

Hello, first time here and was recommended this service. My name is Alberto and I am interested in getting a calendar system integrated into my website so that my clients can book a photography appointment. I'm not interested in a new website/wordpress etc.., just a calendar integration code (html, php, java or other etc..) to be placed in my site files. I use dreamweaver to do a little bit of web design myself so I wouldn't mind doing some of the steps myself such as updating availability dates on the back end. I just need the functional calendar integration code. My current website code is basically this template: [login to view URL] seen in source code or download [login to view URL] file here: [login to view URL] Anyway, in this other link below I have two PDFs that attempt to communicate a visual of the calendar system I am looking to create: [login to view URL] One is a desktop version and the other is a mobile version. There are basically five steps for the end user to complete, and the idea is for the customer to have a super user friendly experience from start to finish. Incase you are curious, it would help if the available time slots are separated in 1-2 hours intervals to avoid booking conflict/allow travel time from one session to other. Example: available from 9am-10am, 11am-12pm, 1pm-2pm, 4-5pm, 6-7pm only Mon-Fri. So again, I don't mind going in the code/back end such as PhpMyAdmin/MySqL Database to alter the time slots or the available days as I think it would be nice for me to have control and ability to manage my data for my records. In conclusion, I would very much appreciate a design that resembles these sketches as best as possible. Is this something that you can do? And what about the functionality steps outlined in the 5 step sketches? In which I can just integrate my Paypal or other merchant service into it. Can this be done? How much would you estimate something like this costs? Thank you!!