I believe this is correct ^^
a. A first officer who successfully completes training in a new Category shall not be awarded another Category for twenty-four (24) months commencing with the first day of revenue service in such new Category unless:

(1) the Category is for newly introduced or re-introduced aircraft;
or
(2) the Category was obtained as a result of displacement; or

(3) the Category will afford the pilot a captain upgrade; or

(4) the Category will afford the pilot preparation for captain upgrade in accordance with paragraph b., below.

b. In the event the pilot desires to upgrade in equipment other than that which he is currently flying, such pilot may bid a first officer position in the equipment in which he desires to upgrade, provided that it is estimated that the pilot will be able to hold a captain’s position in that equipment within three (3) months of the projected completion of his training. A pilot who bids pursuant to this paragraph must bid to upgrade by the end of the three (3) month period in the equipment in which he was most recently trained.

(3) and (4) says even if you're brand new on the dash once you finish SOE according to the pilot contract you can bid out with certain stipulations.