Hey welcome aboard o/ 
Let me throw some comments in.
I understand generally that fighting with two swords or sword and dagger/shortsword is more difficult than a bunch of other kinds of fighting, but you don’t need to spend any points to fight with Buckler and a Sword. It’s also useful to pick up a buckler for when you go and monster, so +1 for you getting one. Experiment, see if people will let you practise a bit with their weapons, like a short stab safe spear, see what kinds of weapons and style suit you.
Also for you first weapons, buying them at the event is considered a pro-move as then if it fails weapon check you can get it replaced immediately. I wouldn’t say this is common with weapons bought from traders at the event but it can happen with any weapon you buy from online or in person traders.
Can also confirm that you can change all your skills, resources and whatever after game one, PD don’t want you to be locked into something you discover doesn’t work for you.
Physicking wise here’s a thread with people talking about some aspects of it, searching the forum for “physick” also gives a bunch of threads that might be useful
When it comes to you “Job” so to speak, one useful thing to think about is what you’ll be doing when you’re not in a battle/skirmish or mission through the Sentinal Gate, which will be the majority of your time at the event. Battles are a few hours long and any kind of mission where you go through the sentinel gate will be heavily subscribed, so you probably won’t go on more than one or two.
I mean you don’t have to, going to Anvil to see the sights and have fun is totally a thing but if you wanted to swap your business for a Mine/Forest/Fleet you could then try out the trading game. Brokers are one of the Navarr archetypes but also doing a bit of trade on the side is a very Navarr thing to do imho .
Oh also while I think about it this is an excellent podcast by some new Navarr players about their first few games. Might have some useful stuff for you.