You're a true looter. And it's unfortunate I was the first to answer this post, since I posted before I hate lootering. I'll help you as far as I can, Raze will probably provide a more detailed answer later.
[1] If you have taken the dragon form, you are now the owner of the battle tower. In the throne room there's an elevator behind the throne, which leads to your personal quarters. There is a giant chest ornamented by a dragon there. You should be able to right-click (on pc) any item in your inventory and choose the option "send to battle tower" , and this is where you'll find it.
[2] I have no idea how to make the most money, as I don't believe such knowlegde is strictly necessary
[3] You CAN leave broken valley and enter the Orobas Fjords before capturing the battle tower (that's where Willey pops up) but that's a deathtrap. You're simply not skilled enough to do that. And I don't believe you'll miss anything if you just skip it until taking the Battle Tower, which is what you are supposed to do.
Would you like to answer this question: did you get this game by GOG, Steam, Larian Vault or retail? I'm just curious.
