There's potentially up to 3 ways to play single player, depending on which edition you have. Competition, Campaign and World Cup (Chaos Edition only). There's also Story mode, but honestly, it sucks.Is the single player campaign any good? Any tips for the settings of the campaign?
I played the legendary edition for nearly 40 hours, but I just did different single player modes and tried a bunch of different teams. I don't feel like I ever learned all of the do's and don'ts except skills on the field.
Competition is a one time deal..you set up how many teams you want in the cup, how many brackets you want, and what kind of elimination you want, and then you play it. When you lose or when you win the cup, it's over. World cup is kind of the same way, but it's set up kinda fucking weird, and I don't think too many people have messed around with enough to figure out exactly what's going on. It's similar in the sense that when you lose, or win the cup, it's over, but it starts out with a lot of really rough mirror matches that most people are probably not gonna make it through.
Campaign is therefore the defacto single player mode. There's a dozen or so different tournaments scattered across the map, and you just go from one to the next, in a neverending cycle of games. It's what most people will play when they play single player. You make a team, and then win or lose, there's always another game available for you to play. Most everyone plays on classic rules because the blitz rules can be really unbalancing depending on what you're playing with. They introduce a lot of things that aren't in the rulebook, and were poorly tested for balance. I guarantee you that you will at some point during Blitz mode have half of your team quit, and you will have no money to replace them. So play blitz mode at your own risk. The AI is bottled with 3 difficulty settings, easy, medium, and hard, but they actually do not correspond to those labels at all. For the AI, "Hard" means taking less risks, which you think would make it harder, but it doesn't. It is generally accepted that the Easy setting is the most difficult setting to play on, because you will see agility teams do some fucking crazy shit when the risk tolerance is raised, and they will score on you.
That being said, with a little bit of time under your belt, you will be able to destroy the AI pretty reliably. It's a decent challenge to a newcomer, but it takes some pretty unlucky rolls to beat someone who knows how to play. For that, multiplayer is the way to go, and there are a number of public leagues you can play in with no effort, and there's also a lot of private leagues around that you can join to game once a week or something like that, if that's your cup of tea.