Welcome to The Rebel Faction; use at your own risk.
It's a great idea to Lurk for a while before diving into the In Character sections of TRF simply because, also as noted above, we have quite the dynamic and evolving atmosphere. I would suggest you start with the Rules & FAQ (both of which are available in the sidebar/drop-down menus) and spend a good chunk of time re-reading that material as, fundamentally, it is pivotal to the continued functionality of TRF. Following that I'd suggest giving our History at least a good once over before moving along to the Planets List (in the OOC) forum. From there I'd point you in the direction of the Battlegrounds... basically everything on the first three pages is current or ongoing.
That should give you a fair idea of how we do things around here, however; if you still have questions or concerns you are more then welcome to come directly to me with said issues. My contact information is available at the click of a button (just scroll over my Screen Name and click).
That said, welcome to the Faction.
Now, pretaining to the issue of Concord Dawn; there is a pre-existing historical recoed here at TRF which differs from the Canon history you may be familiar with. This is due in large part to the fact that much of what was written was done before much of the more recently released information and material. Indeed, a considerable quantity of our material was written by me. Here at TRF I am very intimate with most subjects pretaining to Mandalore, Mandalorians, the Bounty Hunter Guild etc. What you have come up with is good and can be easily ratified with our community. I would suggest you do a search of the Battlegrounds using keys such as; Concord Dawn, Mandalore, The Bounty Hunters Guild and so on.
I would like to assist you further if you have any questions or concerns. Good luck!