Purchased SHS Download online. Can't register product. Need serial number or Redemption Code??? Niether came in an email. Help.

check your junk mail,maybe they are there..

Activation is automatic through the Command Center. There is an manual process too. Both are documented here.
 
Redemption codes are issued by resellers for Cakewalk products purchased from their sites. If you purchased from a third party, the redemption code provided may be processed here. After that, install using the Command Center or use the manual install/activation process.

Registration / Activation is easy using Command  Center like Scook said. If you purchased it from a legitimate online retailer, then there should be no problem at all. 
 
Which online store did you purchase Sonar Home Studio from ??