Mynos
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nprf, I don't want to disappoint you, but offline and online are COMPLETELY different things. To learn how to play online, you need to play against real players, and what better reason for that than a tournament? Make daily saves in the game, and after it ends, review them: how the opponent developed, how you played, ask the opponent questions.
In offline mode, too - request saves and walkthroughs from the winner, try to play the same way, etc.
P.S. Regarding free time for online play, don't worry - you can play for just an hour or two a day and save (fortunately, the game allows you to password-protect saves).