ok... where to begin.....
You can not have signatures with pictures. If you see one, they are copy and pasting the picture into the thread. The pic isn't part of the sig.
on to avatars.
click the USER CP button in the top left of the screen.
then click the EDIT OPTIONS link.
scroll down and press the CHANGE AVATAR button at the bottom.
then click browse button and upload the desired avatar that you want from your computer. it's has to be 64 x 64. You will find that many like to use historical avatars. Mine is the authentic squad insignia of the III/JG26 9th ST. As far as finding historical squads to use, all I can suggest is that Google is your friend.
Ok, on to the other questions. The FIRST place u should go is
HERE. It is the AH help page. Everything that you ever wanted to know about AH is there. I would also suggesting downloading the Aces High Help file located
HERE. Basically the same thing, but handy to have.
A great place to start learning about the aircraft used in AH is
Soda's AH Aircraft Evaluation Website. Lots of great info about the planes, and how to fly them in Aces High.
Another useful link would be
netaces.org. Netaces is Aces High specific, and has soooo much information that I suggest reading everything on it at least twice.
If you need some help learning to fly, Aces High has a fantastic Training Corps that you can email.
Trainers@hitechcreations.com Send them an email and you can set up a time to get some training.
Hope this helped.