Could somebody do a beginniers guide on MP?

[Ataros]

With a RMB click on the map you can turn of extra airfields layer to see active airfields.

In case an active airfield is not clickable move your mouse to the right and a bit below the airfield and move it around looking for pop-up saying smth like bombers1 or fighters3 then double-click this spawn point to get to plane selection menu.

Try the above and get back if you have further questions.

ps. You can always hit ESC and create another new aircraft if something goes wrong (stuck in hangar etc.). After you change to new aircraft do not hit "fly" (this brings you back to the old one) but hit "create'.