Playing FSX Online

Hi all. I'm new to the Microsoft Flight Simulator world, and loving it!
I've been playing combat flight sims for the last 15 years. I just bought FSX about a month ago.
I have a few questions:
-Are there any groups I can join that fly military missions? Or is that a Combat Flight sim thing? I thought I read somewhere on a forum that there are groups who fly combat missions online with FSX?
-What are virtual airlines, and how do they work.
-This is kind of related to my first question: are there military planes with usable weapon systems availabel for FSX. (I've downloaded an F-84, but it has no usable weaponry that I know of.
-Also where is a good source for downloading free quality aircraft. I've downloaded several from simaviation, but only the F-84 looks and flys good.
Thanks in advance all!
I've been playing combat flight sims for the last 15 years. I just bought FSX about a month ago.
I have a few questions:
-Are there any groups I can join that fly military missions? Or is that a Combat Flight sim thing? I thought I read somewhere on a forum that there are groups who fly combat missions online with FSX?
-What are virtual airlines, and how do they work.
-This is kind of related to my first question: are there military planes with usable weapon systems availabel for FSX. (I've downloaded an F-84, but it has no usable weaponry that I know of.
-Also where is a good source for downloading free quality aircraft. I've downloaded several from simaviation, but only the F-84 looks and flys good.
Thanks in advance all!