How to use 2048 bit, SHA256 certificate with Win Server 2008 R2 and IIS 7.5

We've got a Windows Server 2008 R2 Datacenter machine running as an EC2 instance at Amazon.  We've always used and still use the IIS Certificates Manager to generate our certificates as SHA-1 2048bit.  Recently we've had a client ask us to install an SHA256bit 2048 key.  Well, IIS Cert Mgr doesn't do SHA256 so I've used OpenSSL-Win64 to produce a couple of files with this command:

openssl req -nodes -sha256 -newkey rsa:2048 -keyout C:\SSL\mysite2015-09-29_private.key -out C:\SSL\mysite2015-09-29.csr

Which produces two files:

mysite2015-09-29_private.key
mysite2015-09-29.csr

When opened in Notepad++ the files begin and end with -----BEGIN PRIVATE KEY----- / -----END PRIVATE KEY-----  and -----BEGIN CERTIFICATE REQUEST----- / -----END CERTIFICATE REQUEST----- repectively.

I have forwarded the .CSR file on to the client for them to register the thing with their favorite certificate authority.  I have no idea what to do next.

Do I need to somehow install the private.key into Certificate Manager.  There are a million different formats it seems, do I need to use a different format and how would I go about changing the format?  Also, because we'll be using a load balancer at some point I'll be needing the private key in .PEM format.  How do I do that conversion?  Do I need to install some sort of SSL handler to deal with the SHA256 or can IIS7.5 do that?  If so what does that mean for the other 8 certs we've already got installed?
RossaminoAsked:
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footechCommented:
IIS 7.5 handles certificates with SHA256 just fine without doing anything.
For importing, I would use OpenSSL to generate a .PFX file (PKCS#12) which you can then easily import.  Syntax is something like
openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt

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Pretty sure the private key is already in PEM format (Base64).
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