There are 5 action types, each with strict rules as to what can or cannot be accomplished. Part of a standard action is a move. A partial action is usually a standard action minus the move.
"Ready [Standard][AoO: No]
Description: The ready action lets a combatant prepare to take an action later, after a combatant's turn is over but before a combatant's next one has begun. Readying is a standard action, so a combatant can move as well."
On your initiative count you declare what Partial Action you want to take later. You can move before or after you ready the action because Ready is a standard action. BUT, the partial action that you take later does not allow a move. You cannot "hold" your move until after the Partial action.
1) Yes. You can always do less in an action type than the maximum allowed. You could just ready to change the opponent you are dodging. Sometimes this would be the best choice available, but not usually.
2) Yes. The readied action takes place before the action that triggered it. Your initiative count would now be the same as the Orcs (but you would always act before the orc).
3) Indeed, that is the effect of declaring dodge on an opponent.
4) No. For two reasons, one might be a misunderstanding on my part. In Step 1, above, you didn't declare Full Defense as your readied action so you don't get to declare it now. If you meant to include (or imply) that declaration in Step 1, then this isn't a problem. What IS a problem is that you don't get to move when yout take a Partial Action -- and you can only ready partial actions -- so you could begin fighting defensively, but you can't move as well. If you wanted to move you could have moved when you took your standard action to Ready the partial action.
"Ready [Standard][AoO: No]
Description: The ready action lets a combatant prepare to take an action later, after a combatant's turn is over but before a combatant's next one has begun. Readying is a standard action, so a combatant can move as well."
On your initiative count you declare what Partial Action you want to take later. You can move before or after you ready the action because Ready is a standard action. BUT, the partial action that you take later does not allow a move. You cannot "hold" your move until after the Partial action.
1) Yes. You can always do less in an action type than the maximum allowed. You could just ready to change the opponent you are dodging. Sometimes this would be the best choice available, but not usually.
2) Yes. The readied action takes place before the action that triggered it. Your initiative count would now be the same as the Orcs (but you would always act before the orc).
3) Indeed, that is the effect of declaring dodge on an opponent.
4) No. For two reasons, one might be a misunderstanding on my part. In Step 1, above, you didn't declare Full Defense as your readied action so you don't get to declare it now. If you meant to include (or imply) that declaration in Step 1, then this isn't a problem. What IS a problem is that you don't get to move when yout take a Partial Action -- and you can only ready partial actions -- so you could begin fighting defensively, but you can't move as well. If you wanted to move you could have moved when you took your standard action to Ready the partial action.