https://www.warlight.net/LadderSeason?ID=0You can purchase the "mega strategy pack" (not recommended) or reach level 47 to join the 1v1 ladder. I'd suggest leveling, as you're very, very unlikely to do well on the ladder without leveling at least one account to level 47 anyway (levels are by no means an indication of skill, but it typically takes far more games for someone to become decent even if they are a fast learner than it does for them to reach level 47).