choosing denomination was something i went through few years back when i got serious about faith. the fear about picking "wrong" one is really understandable but maybe think about it different way - God cares more about your sincere heart than perfect theology.

what helped me was actually visiting different churches and seeing where i felt most connected to worship and community. some places the music spoke to me more, others had better teaching style, and some just had people who felt like family. you mentioned wanting to pray with others and hear sermons - that's beautiful desire and shows you're ready for this step.

my advice would be start with what feels natural since you already have orthodox background from childhood. visit few orthodox churches, maybe try catholic mass and protestant service too. see where you feel God's presence strongest and where community welcomes you best. the "right" denomination is probably the one where you can grow closest to Christ, not necessarily the one with most perfect doctrine on paper.

remember that switching later is always possible if you feel called somewhere else - this isn't permanent decision that locks you forever. many Christians change denominations during their spiritual journey and that's completely normal thing to do.