Welcome to the community Matt. I will say this: I just got back into modeling about two months ago after a twenty-five to thirty year break. One of the first things I did upon picking up a Revell P-51D @ 1/48, was to start looking for a forum of like minded individuals to help me grow as a modeler. I have got to say that I found a great group of guys here, and that's no joke. These guys have gone out of there way to give help and advice, and when asked, constructive criticism. Honestly, I don't know that I've ever seen anyone speak harshly about anyone else's work other than to give some pointers here and there.
With that said, once you decide on a subject, your BF-109 for example, do a little research on it that compares various kits. Then, don't be afraid to ask these guys. Several have been modeling for decades, and odds are that someone on here has built a particular kit your looking at. They can tell you if the kit is good or not so good, and what to watch out for, ect...
Another thing to consider is the world of after market (AM) products available. Say you pick up a Revell F-4B, but you hate the interior. No problem, you can get on-line and pick up a new cockpit that has the detailing you like, or wheels, or flaps, or pilots, or mechanics, or, or, or, or, or... You get the idea. And most AM isn't very expensive either, though it does add up quick. A good place to look is Sprue Brothers: store.spruebrothers.com/default.asp
There are people on here that know much more about paints than I do. However, I picked up a set of Tamiya acrylic and haven't looked back. I broke down and got an airbrush, and that Tamiya, mixed 1 to 1 with 91% rubbing alcohol goes on like silk, is very forgiving, and looks great to boot. Hopefully, some others will chime in on this one as well. I'd like to hear a bit more on the subject too.
By the way, Revell's, P-51D at 1/48 designed after Bud Anderson's "Big Beautiful Doll" was a decent build, especially considering it was my first build back. The cockpit isn't the greatest and you really need to do a test fit of the seat and canopy before you glue the seat in. Otherwise, the canopy will not fully close. Luckily for me it wasn't a big deals, just something to watch out for. I ended up putting the decals in the parts garage and making Lt. Robert William's "Duchess Arlene"... Here's the link to it, if you want to see it. Like I said, it was my first build after a very long time.
cs.finescale.com/.../157342.aspx
Also, and take it for what it's worth, go 1/48 or larger... My last model was a 1/72 (a P-51C) and I'll do it's mate for my wife, but that'll be it for 1/72 scale for me. It's either that, or buy an electron microscope :-)
Well, this was much longer than I had wanted... Especially for just wanting to say that there are a good bunch of people on here and to utilize them. Good luck!!! I can't wait to see your builds, Raymond