Welcome aboard Jeremy. I hope you enjoy your visits here. It's a good group, lots of different levels of experience and areas of interest. and most are pretty patient and helpful both with new guys and those of us who've been at it for a while.
As for the Revell P-39, it's a great kit to start with. Interesting looking, easy to build, and quite a bit of detail without having to add stuff. If you'd care to, feel free to share a photo or two. It's always fun (and inspiring) to see what other modelers are up to.