Booking, inventory and itinerary

I need help with some things…
:When making the reservation, in the booking form does not show the checkout if the user is not logged in (even with this option in the admin enabled), when logged in by admin it works normally. exemple: http://penatabuatursc.com.br/tours/excursao_foz_do_iguacu/

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We need to show the possible boarding city on the bookingform, to be fed in the admin
We need that the user only choose his place in the shipment, and the ones that have already been chosen, can not be reserved.
Can I manage an inventory control of reserves?