A reservation module for a dogwalker

I'm new (just today) to Drupal and so far am very impressed. I've used Wordpress before and am a so-so sys admin with a little web dev experience.

I've recently acquired a dogwalking client to setup a website for and after struggling to find a solution using Wordpress I came to Drupal hoping for a lucky break.

The dogwalker requires;

1. Reservation of 1hr time slots for multiple staff members within staff working periods (ie. 9-5 for Geoff and 12-9 for Mark).
2. Reservation of whole day slots for pet sitting.
3. User handling to the point that the public can see a general calendar but registered users can book slots after
4. ... going through a payment gateway for a desired service (one-off walk, repeat walks or pet sitting).

So far I've found a few modules that will no doubt be useful, but not a reservation system with payment gateway that covers my needs. My list of modules installed so far is;

• Content
• Calendar
• Calendar iCal
• Date
• Date API
• Date Locale
• Date Pop-up
• Date Timezone
• Date Tools
• Featured Content Slider Block
• Views
• Views Exporter
• Views UI

And a bunch of Core-optional modules as well.

Could anyone advise of current reservation modules that fulfil my criteria? (reserve+take payment) Alternatively would anyone introduce me to how/where to start playing with the modules / make a bid of how much they would expect development of such a module to cost.

Thanks in advance.

Feel free to contact me by email if preferred : afd@afdit.co.uk