[Savoie45]

From what I've noticed as a fellow noob is that most don't really bother with the role tactics, because they're a little vague, so they let the AI choose. If you want to bother with them, my suggestion would be to read the manual, then read up on scouting reports for your players ( not in game either as they are also rather vague). Do you understand why most don't bother yet? Those that are new at least.

As far as the lines go, I go online and use the lines the team is using in reality. The issue with that the role tactics are tied to the lines, so if you choose to have the AI set your role tactics, it also adjusts your lines. Thus you have to move the players back and ugh...You can change your role tactics during a game, but how much depends on your coach rating for In Game Tactics when you do the manager setup.