I've replied to your email but will post here also because I know that a number of folks often ask the same questions.

---

"Can you mirror bones you've already laid out? (my mesh is symmetrical, can i select something and mirror on X?)"

You can mirror the joints to bones once created but you can not create bones for the right and have Poser create bones for the left. To enable mirroring ensure that your bone names follow the rBodypart, lBodypart nomenclature.

 
"Where do I place my bone for the eye to rotate correctly?"

Place the center of the bone in the center of the eye.
You will also need to delete the joint channels in the eye or else they will have an adverse effect on the head. I tend to also delete the eye related joint channels in the head also for good measure. See the P4 man for an example.

Other options are to un-check the bend option for the eye but this will negate any morphs you may want to add. Or add a dummy bone between the eye and the head.

"Can I add bones that will not correspond to an internal mesh name just to keep the skellital structure more "realistic" in my head?"

Yes, these are generally referred to as "Body Handles" and are covered in my tutorials:-
http://www.philc.net/tutorial9.php (text)
http://www.philc.net/Body_Handles_the_Video.php (video)

---

"If you could help me out that would be Awsome. Or, if you know of somewhere that already runs through this  info if you could send me a link?"

For links to all my rigging tutorials go to http://www.philc.net and click on the left hand menu Tutorials > Rigging

If you have already grouped the model you may find that the File > Convert hierarchy method quicker. Then just use the set up room to add the body handles.

Hope that helps :)