Hey Josh!
Here's some answers for you. Yes you can start out with shipbuilding or something thats 'common' or that makes sense in the mizaharian environment. We'd expect you to eventually post a writeup with a skill progression (or request one of us staffers to write one for you). The price list has a 'list' of ships and shipbuilding supplies that should give you a great idea of what exists here.
You can invent different types of weapons, so long as its something that does not give your PC an advantage over other pcs... and it s something others can take. It would be nice to see a world development article on the weapon, how its used, and what it is... but if its a sword, you can always take sword and use your own unqiish sword so long as its not magical - you need permission for magical or magecrafted items via the help desk.
Magic can be learned through trial and error, from watching others, from a teacher, or from a book. Its fairly common and it would be no issue to learn it after creation in most cases.. magic like magecrafting is cost prohibited so that's the only one you might have issues with.. .its very very expensive, in some cases thousands of mizas, to produce items.
Hope that helps! Also you double posted this thread, so i'm going to delete the other one.