I would suggest you to download Jboss again, as at least one profile ('default') should be present under server folder. And in 5.1.2 it surely have conf folder by itself.
And content of bootstrap.xml is like:
<?xml version="1.0" encoding="UTF-8"?>
The list of URLs for mc beans to load during bootstrap.
$Id: bootstrap.xml 112288 2011-10-04 14:59:56Z mbenitez $
Then, in 5.1.2, you should be having "server\default\conf\bootstrap" folder which contains all bootstrap related xmls.
Also, there should be 'server\rbs\conf\bindingservice.beans' present by default. There is 'bindings-jboss-beans.xml' present in this folder for all profile related bindings.