just a couple quick thoughts.

Most important with online Dom or without is to read, read, and read some more.
The respect between the Dom and the sub is a given thing. a cycle....
In my eyes if the Dom doesn't get your respect by how they act without saying a word.. they you're not likely to give it anyways.
Watch perspective people online.. how do they act...
do they make you go "hrm...." in a bad way....
do you read a comment and go "oh no... "
If the first thing he says is You will... = drop them.
IF the second thing is a image request or web came of this or that. = drop them.
those things come with time if ever. and I do mean If ever.