Appoinment+ and Marketpress Integration set-up.

Hey there I'm new to these plugs so please forgive the nooby questions.

Are there step by step instructions on how to integrate Appointments with Marketpress?

I ultimately want the user to select an available appointment which they then 'Add to cart', when they go to the cart I want to offer them additional products they can purchase for the appointment.

I have the 'Integrate with MarketPress' option selected in Appointments+ but the user isn't given an 'Add to Cart' option, they are asked to confirm the appointment then sent straight to paypal.

I have also made a 'Product' in Marketpress, but here the user only gets to buy a product and not select an available appointment and provider time.

ALSO, I want the user to be able to select a 2 hour appointment that begins from any 30min window in the day (e.g.; 4:00 / 4:30 / 5:00 / 5:30 etc). I don't want the appointments to be set as 2 hour blocks (e.g.; 10-12, 12-2, 2-4 etc). I want the system to allow any half hour start time then recognise the next 2 hours as booked, first come first served.

Can anybody help with any of these questions please?

Thanks in advance.