Let me start of by letting you know that I do not work for YAP2, I'm just a average simmers who likes aircrafts from the cold war era especially those involved in the SE Asia conflict. I love how YAP2 is a sims that has a story behind every mission.
When you ordered YAP2 from yankeeairpirate.net you will receive an email that has your user name and password to be use in the members area of that site. Your first disc that you will receive will have some training missions and 15 missions. If you have not received your ID and password just go over to the Yankee Air Pirate forum here at SimHQ.
I had a problem getting my ID and password but after informing YAP support I received it within an hour after they received my request.
Here is a link to a thread by a recent customer who just ordered his YAP2 disk and got his ID and password issue resolved:
http://simhq.com/forum/ubbthreads.php/topics/2755073/Mission_Packs_and_Purchasing_Y.html#Post2755073 Once you get your ID & password go to the missions briefing area at yankeeairpirate.net and you will be treated with outstanding briefings with photos and even Google Earth picture of the targets!
As of right now in YAP2 you can fly the UH-1Ds, the various UH-1Bs gunships, AH-1G Cobras, the CH-47 Chinooks. The developers forum also shows HH-3 Jolly Green Giant, and the Navy's SH-?? Sea King for Search and Rescue in the upcoming mission sets.
I hope this answer some of your questions regarding YAP2.