Multiple Email Issue Resolution

[aussieute]

I am looking for someone to resolve the following email reporting issues.
I am looking for someone to fix these issues for me but at the same time provide details as to files and code modifications so we can be self sufficient into the future.

Issue description
Customer View
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1. Customer adds item to cart
2. Goes to check out
3. Confirm details
4. Email is sent to customer with their order specified as "pending"
5. Customer makes payment
6. Customer receives another email as "pending" again - should be "Confirmed"

Shop Owner View
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At step 4 above email is received as "pending"
Shop owner never receives a confirmed email or cancelled email (should the transaction fail).

Shop VM Admin View
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Some items appear as pending, transaction successful
Some items appear as Confirmed, transaction successful
No cancelled orders (payment failure) have ever appeared even though the transaction is confirmed as failed at the bank.

What we want to happen
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No Customer Pending email sent at step 4 to customer or shop owner
Email confirmation after credit card payment sent as Confirmed to both customer /shop owner
Email confirmation as pending to to both customer /shop owner when Offline payment is made


Payment Gateway = NAB Transact (non negotiable)
Further information can be provided as required as to the rationale and changes made to the current system.

PM me if you are interested.
Include rate for work, knowledge of VM, and any references to work you have worked on. Thanks