User blog comment:LukeDocker99/Alternate Order 66/@comment-6450637-20140404023915/@comment-5599546-20140404025758

The rebels are formed many years later in The Force Unleashed. If your talking about going Rebel right after Order 66 then I'm afraid to say that there's no Rebels yet. So your only chance is to escape and hide until 2BBY where Starkiller forms the Rebel Alliance. Hope this helps.