First question

[Vesku]

Tournaments have different rules, some take new players through its duration and some close the recruitment after start. All this far has used the free download versions, no CD necessary. Version needed is given when the tournament is introduced. You don't need experience to join, they are open to all interested but you are not allowed to pick your opponents so you may end up playing a pro.

Check the forums of Europa Twilight and Achtung Panzer!, those are running at the moment. ET might be open for joining but AP! has it's rows full.