1. Animal trainer allows your animal companion to basically get free actions. Whenever your character activates the animal companion gets to also make an action.
2. bulk is only for things not in a character's hands. So your weapon your currently holding doesn't effect your bulk.
3. Yes your stamina can be reduced to 0. The character basically becomes too tired to do anything and may need assistance from their companions.
I'm working on an updated version of the rules where I will add vehicles and a wider variety of equipment and weapons.
As for the 1 handed vs. 2 handed thing I should make that more clear. a Sharkanoid has 2 hands each hand can hold 1 thing, but if the weapon is 2 handed it takes up both.
