Update Database via Workflow

Hi Experts;

I am new to workflow.I need help about the following:

I have made a workflow about creating absence.I want to update db using methods.I have created an object(ref:ABSENCE).I have added methods using bapis.I have created a step referred to this object in the workflow and under the methods tab i have added the methods i need(enqueue-create-dequeue).

I dont know if i have put these methods to correct place?Do i need to use bapi_transaction_commit in these methods?What do i need to do?Please send me the steps of updating database using methods.

Please help