Hello.
1) The ability to have independent calendars (for your different products) possible in any paid versions of Booking Calendar. Check more here https://wpbookingcalendar.com/overview/#booking-resources
You can watch video overview about this feature here https://wpbookingcalendar.com/help/multiple-calendars-video-overview-of-booking-resources-in-booking-calendar/
Please read the general instruction about usage of paid versions of Booking Calendar: https://wpbookingcalendar.com/faq/general-usage-instruction/
You can create the different booking resources (your properties or services – unique calendars) at the Booking > Resources page and then you be able to insert booking forms for each of your booking resources into the posts or pages. Please read more how to insert and configure the booking shortcode into the post or page here https://wpbookingcalendar.com/help/inserting-booking-form/
2) Unfortunately, the Booking Calendar does not support integration with WooCommerce plugin. Sorry.
The Business Small and higher versions of the Booking Calendar is support Stripe, PayPal (Standard and PayPal Pro Hosted Solution (please note, PayPal PayPal Pro Hosted Solution its does not the same as PayPal Pro)), Authorize.Net, Sage Pay, iDEAL via Sisow and iPay88 payment gateways integration, other payment systems are not supporting yet. You can configure and activate it at the Booking > Settings > Payment page.
Please watch more in this video: https://wpbookingcalendar.com/help/booking-calendar-video-payments/
If you want to make the integration of your payment system by yourself, so you will be able to check how was integrated exist payment system in plugin like Stripe payment gateway. Please check more about this here: https://wpbookingcalendar.com/faq/custom-gateway-in-7-0/
Please note, if you will modify the source code of the Booking Calendar, we will not guaranteed the correct work of plugin and do not support it.
Please note, this forum is only about the support Booking Calendar Free version. If you will have any questions about the paid versions, then contact here https://wpbookingcalendar.com/contact/
Kind Regards.