SSIS Package Transaction Integrity

0) We are migrating data from SQL Server 2000 OLTP design to SQL Server 2005 OLAP design.

1) We have an data flow task SSIS package.

2) We managed to send a mail with various variables & their values in subject or body of mail.

3) How do we send mail with details of Error/Warning using OnError/OnWarning events?

4) Can we have bad tables i.e where records which failed to migrate get inserted into. If yes, what are the steps to implement this.

5) Can we have a mix of in-built & custom logging. Is logging provider necessary to do logging. What logging provider to use?

6) Where are the errors that come during build, deploy, install and execute stored? Is there a log file(s) & what it their location?

7) Please post links if that is better.