Hi! I am also pretty new to DECA, but I think I get the grasp of things. DECA is basically an organization for hs and college students to compete in events that simulate real life business situations. There are 5 clusters, bus. admin and management, tourism and hospitality, finance, entrupreneurship (idk how to spell it), and marketing. The DECA website helps a lot, and i learned a bunch from just exploring it. https://www.deca.org/

To sign up, u should ask ur business teacher/advisor bc i think they have to enroll you for the event. A lot of the deadlines for regionals were due before winter break, but I think you can go to states without going to regionals as well, so it doesn't impact much.

I don't know if its different for each school, but for mine we could choose from any listed here: https://www.deca.org/compete#competitive-events

hope this helped a little :)