Hello and welcome.

The international school hiring cycle is probably complete for the upcoming academic year. Recruiting (often through agencies) starts in the early spring with job fairs and postings. Most certainly bring your educational qualifications and proof of teaching certifications. I can't help you with Brexit, but bring whatever teaching supplies you can as availability here for English supplies is really limited. I shipped mine from the States.
Deep breaths. Sometimes you don't know what you need/what/should do first until you get here.

And you're only a short hop from...where are you from originally? And what year do you teach?