Joining a tournament

I awoke the next day excited to start my journey to the top. I quickly pull out my device and check out my status or profile.

Rank: E

Matches: 0-0

Won against:

Lost against:

Money: $5000

‘So this thing can keep up with everything huh? Nice.’ I keep checking out the device before noticing I can sign up for a tournament. Looks like a E rank tournament. Perfect’

I quickly sign up noticing there was only one spot left.

{ Bzzt! Thank you for registering for a E rank tournament. Please head to arena 48 for your first match in two hours.} the device says.

Ok that was quick but what now?