Welcome JimmDee55!
To answer your main question, we are currently using the IL2 Great Battles series of games. You can download it at their website:
https://il2sturmovik.com/
I would hold off on making any purchases at this point until we have had a chance to talk about your experience and our current squadron openings. Each theater game(Battle of Normandy, Battle of Boddenplatte etc) allows you to fly a specific number of planes and we would want to make sure you are getting the planes you need to fly in our campaign. It sounds like you are interested in flying bombers? I believe our bomber squadron is currently full at the moment. Are you interested in fighters or ground attack?
The next step is to get in touch with one of our recruiters so we can chat about your flying experience, what our campaign is about, and answer any questions you might have. The best way to do that is to join our discord:
Discord:
https://discord.gg/th3wJDuseJ
Once you join discord, send me a message. I will also keep an eye out for you. Let us know if your discord name is different than your forum name here so we don't miss you.
Looking forward to meeting you.
Dadnar