Check out the different leagues, send out some friends requests, send a message inquiring to join the league. League games are great and the chat is great. Welcome and good luck.
Generally speaking I would say almost no one on RP takes poker very seriously. This is a good and bad thing!
I often play ring 1/2K 2/4K 5/10K and I will frequently play on tables where every player limps or else its an aggro table and there will be semi frequent open jams ALL IN pre flop on 4 & 6 MAX.
There is deff lots of good players on RP but unfortunately 100x more bad players.
Some MTT/SNG games might be a bit more “serious” as well as some League that require invites to.
League are basically private, but in essence basically open to almost anyone willing to play! You will need to be added by the League Organisers.
Some League have some basic requirements/commitments for joining that are mostly pretty simple.
You can easily gate crash a table that is running for a League and make known your interest to play/join. Otherwise try adding some players that Organise a particular League and sending a PM expressing interest or just contacting friends of friends.
Otherwise create a post on these FORUMs expressing interest in join a particular League or any you are comfortable playing in.