Hi and congrats!
With my first I tried various swaddles before we found what worked for us. It is confusing with all the options! My advice is to remember all babies are different and will prefer different things, there's no right or wrong way.
I recommend the miracle blanket if you want to swaddle with the arms down, but my little one preferred her arms up so we ended up using the love to dream swaddle me up. It was absolutely brilliant! Will def use it again next time around. We then put her in a sleeping bag at about 3 months I think.