For an easy aircraft to fly especially in the early war years I would recommend the Bf109E4 or E7 in the Luftwaffe, or the B239 in the Finnish Air Force. The opposition are usually less experienced to start with. I first flew the B239 for the Finns between 1941 and 1943 in the stock campaign. By the 50th mission I could defeat most enemy aircraft, even the newer types. A campaign gives you more of an immersion than a single mission.
The BF109 seems to be recommended a lot, so I'll have to give it a try. My grandfather was an AA gunner for the Canadian army, so maybe Grampa will end up shooting me down (-:
I first started with the B-239, but I'll wait until WxTech finishes his tweaks.
Would you recommend anything from the US or RAF? I'm not sure if I'm ready to tackle carrier ops just yet.
It also depends what difficulty levels you set yourself at the start. Some people prefer to start at the easiest level and work up to full difficulty but that way can lead to settling in a comfortable rut. You can come at the learning by starting at the deep end and setting the highest level straight away, then reducing the level to what you are happy with. A much tougher learning curve but more rewarding when you succeed with practice. There are many here who can guide you.
I'm currently using full CEM because I'm going for a fairly authentic WWII experience (obviously a sim isn't exactly the same). If the pilots had to manage things like prop pitch and mixtures, I'd like to do the same. Also, I don't want to learn bad habits by having too much automated for me. I have even been reading old aircraft manuals and watching some training videos to get myself immersed. I have cheated a bit by turning on the aircraft labels, but I figure that's a reasonable compromise because the graphics aren't photorealistic. I'm still pretty bad at flying, but getting a kill with full CEM on gives me a rush unlike anything I've had in a game before.