How to create Approval Workflow in Sharepoint 2010 Foundation?

We want to create a approval workflow in Sharepoint 2010 Foundation for Leave Request.
Because Approval Workflow template do not included in the Foundation version, we decided to create a new workflow for a new custom Tasks list.
Could someone guide me how to do that?

My draft idea:
1. Created a custom Tasks list(Named Request_Tasks) and the use Sharepoint Designer 2010 to add a workflow(Named Request_Tasks_Workflow) to it.
2. Then added a new column(Named Approval_Status) with two choices: Approve, Reject.  Department manager will use this filed to approve or reject the request.
3. Applicant add new task and corresponding department manager will get a email notice and then approve the request.

But there is some security concerns.
1. How to do not allow applicant change the Approval_Status value?
2. How to handle permission at item level? Other applicants only able to access own request.

Thank you.
dickchanAsked:
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