First time visiting my local Chabad House—What should I do/expect?

For the past few years I’ve been trying to increase my observance and further connect with my local Jewish community. I go to a pretty small Conservative synagogue with some lovely people, but since it’s so small there aren’t really any programs or events outside of Shabbat and holiday services (and the post-Shabbat Shacharit lunch, ofc), so I’m trying to find places where I can explore more Torah and maybe attend some community events (ie. The Chabad closest to me is hosting a challah bake soon), and maybe get resources for getting Judaica as there is not a Judaica shop in my city. I’d also just like to expand my circle of Jewish acquaintances. So I signed up for a Torah study event that’ll take place next Sunday, and I’m a bit nervous. I’ve been trying to keep up with parashot this year but to be honest I think I’ll feel dumb compared to the people there that could’ve been studying Torah their whole lives. Like I said, I’m a Masorti Jew as of relatively recently (I would consider myself reform prior) and I’ve never been inside a Haredi synagogue. Is there any specific etiquette I should know? Tips for surviving a Torah discussion with much more learned people? Dress code? I typically wear a short-sleeved button-down and slacks/nice jeans to temple, but maybe I should be in a long-sleeved shirt while visiting a Chabad House instead?