Audit Planning and Types of Audit Tests & Internal Control in a Financial Statement Audit

I need help in the following: Audit Planning and Types of Audit Tests & Internal Control in a Financial Statement Audit. Please see the attachment. Thank you.

How much should the auditor use the client's staff in performance of the audit?

How much should the auditor use the client's staff in performance of the audit? What factors should be considered?

Auditing is constantly changing. How do you plan to stay current after leaving school (for purposes of this question, pretend you have become an auditor)?

Auditing is constantly changing. How do you plan to stay current after leaving school (for purposes of this question, pretend you have become an auditor)?

Why is it not right for checks to be mailed by check signer and what type of test control need to be put in place to prevent this?

Why is it not right for checks to be mailed by check signer and what type of test control need to be put in place to prevent this?

What types of errors or fraud that could result when vendors' statements are not reconciled to the accounting records and purchasing managers who also purchasing goods manager to approval vendors?

What types of errors or fraud that could result when vendors' statements are not reconciled to the accounting records and purchasing managers who also purchasing goods manager to approval vendors?