Having EVO on ur name means you want to play with some other player who also wants to level up his cards... It is explained somewhere in the game rules. Just read it.
ELO is the elite tournament where in you can win a collector card if you make it to the top 25 of ELO. You can start playing ELO upon reaching level 20 but you need to have a deck that is qualified for ELO. Some cards are banned in ELO and you have a limit of 25 levels for ur deck if you want to join the ELO tournament.