I am a beginner with Oracle, so I was wondering if someone
could help me out.

When I create the initial database(system, temp, users, control files, etc),
what is the best way to verify that the creation was a success?

When I look at the logfiles, there are error outputs, mostly
because of the drop object command before the create object command.
But some errors seems suspicious.

is there any simple way to verify the creation success?
is there any DOCUMENTATION on which errors are to be expected?