Flamengo tickets experience

I am a Brazilian citizen with a CPF and I am bringing my buddy with me to Rio in march. I hope to secure tickets for the Flamengo vs Remo match on the 19th but I haven’t been in a long time and I heard the system is completely different. I don’t know if I need to register as a member to guarantee the tickets and I am also wondering what process my friend will have to go through as he does not have a CPF. Please share the experiences you guys have had going to these games recently because I honestly don’t know much about them anymore.