I'm a little unsure because you're asking about the opening break shot but the examples you mention are for continuing break shots.
As far as setting up a break shot for practice, the best tip I can give you is to practice them all because you will need all of them. The classic side of stack is good. As you mentioned, some players will start with a break shot into the side pocket. The key here is to make sure you hit the top of the stack and not the side of it.
There is also the side pocket break shot where you have the CB and the OB very close to the side pocket virtually kissing with the OB dead into the side. Barely grazing the OB, the CB then caroms and heads full bore into the top of the stack.
Hope this helps.
Welcome to the forum and 14.1!!!!!!!!