Welcome again.
You sound like you're in the same position as I was a little over a year ago.
I can't really help with which models to go for as I don't really do military. However, I can echo much of what has been written above.
The first model you do will be a disappointment in a year's time. That's simply because you will learn so much as you progress that it will be missing much of your new knowledge.
I've done five models since I've been on here. The first two look like they were done by someone else. In fact, on my Cutty Sark alone, it looks like two different modellers worked on it, simply because as I went along, I added new techniques I could have added earlier.
So, my advice is go simple early, and learn as you go. Choose a straightforward model, get the appropriate
Revell acrylics, a basic set of brushes, tweezers, snips and glue, start a thread here and think about what you want at each stage. Then ask questions and you'll get, in my opinion, pro-level answers. Sometimes they'll be what you should have done, not what you should do. That new knowledge will enhance your next model.
If I'd started by wanting to do full weathering, wood effects, kit bashing and lighting when I started it would have been too much, and I might never have continued.
Most important thing is show your builds here as you're doing them. Advice is always kind, encouraging and motivating, not to mention interesting. This is not a 'normal' forum, you will not get negative criticism.
Pip Pip!