Definitely bring some synthetic underlayers to keep you warm if it gets cold or wet, and enough socks to change if your feet get wet or sweaty. Seconding sturdy hiking shoes. Bug spray.
If you have nowhere to be, hang out in or around the tavern, watch people, ask about your new home and neighbors, buy someone a “drink”, ask around for the guild for your header, follow the mob of people that’s excited about something.
Bring a bag or utility belt or something that has pockets. You’re going to need to store money, random rocks and flowers that you find, your water, snacks, etc.
Try not to break immersion, it’s way more fun when it’s believable, but keep yourself safe above all else. Bring gloves/hats/scarves if you’ll be freezing, modern water bottles if you don’t have anything better yet, comfortable shoes. You can work on finding more in-period alternatives as you play more, but don’t make yourself unsafe until you find the right props. There’s going to be mud this season. Wear shoes that can get dirty and probably a little wet.
The number of different calls confuses me sometimes, but it’s generally safe to assume any attack that hits you does 1 damage. Most attacks are uncalled: nobody says anything when they hit you with a sword. Some attacks have an elemental prefix (fire, ice, earth, air, others), which you can safely ignore unless you know better (except Spirit. Don’t take spirit damage or effects unless you are a ghost). Taking 1 damage of fire is no different than 1 damage from a sword, unless, for example, you have a fire-proofing thing on. Some attacks have an effect (pain, maim, pierce, cleave, etc) which makes it do a different thing. Pain: instead of taking damage, roll on the ground in pain. Maim: instead of taking damage, lose use of your limb. Pierce: I clearly need to go refresh myself, what does this do, ignore armor? Cleave: instead of taking 1 damage, take 5 damage. Familiarize yourself with those ones (I keep a printed list in my pocket, just in case).
Die loudly. If you get knocked to 0 hitpoints, make sure someone notices you fall down, so you don’t have to wait 5 minutes to get up. If you get critical’d while unconscious and defenseless, you better hope someone knew where you fell.