eCommerce and shipping

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Good Evening,

I just have a quick question about the business process that is associated with using an eCommerce site. Currently my client does all of his sales "in-store" but he wants to expand to online sales. I want to use Concrete5 because I think its pretty awesome but I have to get a few questions answered first:

1.) When a product is ordered online, will an email with the shipping information be sent to my client so that he can then package and ship the product?

2.) Does it make sense to use USPS flat-rate boxes versus the UPS or Fedex plugin for eCommerce?

3.) Can I implement Merchant Link into the eCommerce block by accessing Merchant Link's API?

I apologize for the length of this post, but I am just looking for a little help.

Thanks in advance!