Essential video accessories for a Sony a6400 vlogging setup?

so i finally saved up and bought the sony a6400 because im going on this huge trip to tokyo in like 14 days and i really want to start a travel vlog but honestly im staring at the box and i have zero clue what else i actually need to make it look decent. i tried taking a video in my room and the sound was just like... terrible and super windy sounding even though i was inside? i think i need a microphone but there are so many options and i dont know which ones even plug into this thing. also the screen flips up but then if i put a mic on top it blocks the screen so how do people even see themselves?? im really stressed because i only have about $300 left in my budget after buying the camera and i need to get everything ordered like yesterday so it arrives before my flight. do i need a special handle or a stick to hold it so my arm doesnt get tired? i saw someone using a fuzzy thing on their camera too. sorry if these are really basic questions i just feel totally overwhelmed by all the gear out there and dont want to waste money on stuff that wont work for a beginner. what are the absolute must-have things i need to buy right now so i can actually film myself walking around japan without it looking and sounding like a total mess?