Considering this is your first video, I think you've done well. The background music is a bit loud tho, sounds like at the same level of volume as your voice. I think investing in mic would improve your sound quality as well.
And unless it's for Short video, to me I prefer landscape orientation, tho it's no problem if you want to make portrait orientation as your signature style. Every YouTubers has their own style so that could be yours too haha.
Take your time, we can already see you at the top (like Mihawk is) in near future and beat that KOL and other OP YouTube guys lol.