There only two things that would change on your SCH C.
1. The name of the business
2. If you obtained an EIN for the business, then you will change the SSN on the SCH C, to your newly issued EIN.
There's only two things that will change in Quickbooks.
1. The name of the business.
2. If you told QB you didn't have an EIN, then you either entered your SSN, or if entered earlier in the program, the program automatically uses your SSN for the business. In QB, simply select the option that you now have an EIN, and enter the EIN.
If you need help with QB, I can only help if you're using the CD/Desktop version of the program. Otherwise, seek assistance in the QB support forum.
