Few questions about approval module

Few questions about approval module

Hi,
I have few questions,
 1. How I config a template service where user can access  to select users/persons for approval stage 2, 3,... of service?
 2. How can set  Leave Types for requesters?
            Example:
            User1 completes a request and he selects for approve his request User11 and User12.
            But User11 it is in Casual Leave.
            When User1 send the request it should display the error that User11 it is in Casual Leave and description error should request another user for approve.
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