Customizations in Onestepcheckout (Magento-Script)

I have installed a ready custom Magento script (Apptha Airhotels) on [login to view URL] and need some further customizations: Clients can book properties and must pay deposit and booking fee in advance by onestep-checkout (already installed). In Onestepcheckout I need the following changings (see also the attachments for optical clarification): 1. Complete the display of number of people (under accommodation title) with "people" 2. Complete in the same line the display of value from the attribute "privacy" 3. In the next line I need the display of value from the attribute "breakfast_inexcluded" 4. Change the sequence of Departure- and Arrival-dates (Arrival date first! Actually Departure date ist shown it's vice versa) and set "Arrival" before arrival date and "Departure" before departure date! 5. Change format of calender date from english (mm/dd/yyyy) to continental european ([login to view URL]) 6. Before Booking button you can see 3 lines of checkboxes. In the last line ("...Stornorichtlinien) I need link to the attribute-value of "cancelpolicy" (similar to the line above - "...AGB und Nutzungsbedingungen"/terms and conditions) 7. Last task: I have some price rules for cart (deposit in percent), but they're not working in onestepcheckout. Please bring them to run! I look forward your bids