Welcome Ben there's lots of information scattered around on here, the files section has scenarios and campaigns. As Gully Raker said there are scenarios and game reports in OTT section of the
WGF Campaigns board. You can still download the original rules for Wings of War and they have quite a few scenarios as well.
Planes are harder, try Green Knight Games, Games Quest, Games Lore all UK companies, planes are cheaper in the US, Miniature Market being good and postal rates from them are good, you will probably have to pay tax and a post office collection cost flat rate £8:00 I believe, I've bought 3 times from them and had to pay twice but not the 1st time!
Theres a very nice chap in Australia, I'm afraid I can't remember his name but he advertises on Ebay but is a member of this forum and used to give a discount to members, I've bought from him once and he had a lot of hard to get planes. I contacted him here and ordered direct.
Look at Clippers list in the for sale section lots of planes last time i looked, i bought 8 planes and postage was $20-24 can't remember exactly.
As already said the Aerodrome store is a good source, especially for the new planes that are coming.
Entoyment has been mentioned twice, I've searched their site a few times and only come up with mats and accessories, never any planes, I must be looking in the wrong place, if you find anything can you send me a link, I'm due to go near there in a couple of weeks time and could call in if they have anything interesting.
Shapeways do a lot of 3d printed planes, Teaticket has a list somewhere, they need prepping and painting and cards printing, Valom do kits, love em or hate em they are a useful source of planes as well.
Good luck with the search, it does become a bit addictive.
Cheers
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