For some initial answers, you could look at the FAQ section at https://www.reddit.com/r/AskHistorians/wiki/antiquity#wiki_sea_peoples.3A_who_were_they.2C_where_did_they_come_from.3F . In the app, the # anchor doesn't work, so you would look for "Sea Peoples: Who were they, where did they come from", maybe a third of the way down. The users mentioned there were /u/kookingpot and /u/Bentresh .

But that's intended as a starting point, not to discourage discussion. Follow-on questions, data, and debate are welcome.