John:
Welcome back, fellow Returnee! I dropped out in '75 and returned in 2008. Armour then, armour now.
Talk about world change! At least Tamiya and Italeri still exist!
For whatever it's worth: Just jump in on a subject you like! Do internet search to see what kits are out there and what some folks have said about them. Get a kit - pick from respected "less fight" kits (so, pick from major modern brands and avoid things like Alan, RPM, Mirage, Heller, etc., which while often very interesting, tend to be much more fight than ready, comfy build- I'd go with Tamiya, Dragon, modern Trumpeter, AFV Club, HobbyBoss, Bronco - but read reviews on the kit you look at before you buy to see if it has some real wrestles in it- warped hulls, stuff which won't fit, etc.)). Assemble your tools and work-space. Open the box and grok the parts and the paper. Start slowly and work into it. ENJOY the plastic and the "work"!
Indy-link tracks? For German, it's the way to go. Take your time and it will come together. Dragon does about the best in a kit (I love MagicTracks). I first met them in 2008 - only complaint I've ever had about indy links was due to my doing tiny tanks (Panzer I) - the links are really tiny. "Real" tanks, like Panzer III/IV, Panther, Tiger - are just a breeze. The links are big enough for me to actually SEE!
Parts count? Tamiya does have less (fewer)... But honestly, most Dragon kits, while more replete with tiny pieces, are actually pretty fun. And more parts might get you more detail, too! You've already built, so just jump onto a Dragon if it's something you like!
PE? I first saw PE in 2008. First metal bends and first cyanoacrylate (superglue) gluing were a little bit scary, but I came around to enjoy the stuff in the kits, and you will, too! Most modern kits have some PE, and many offer options to use it or not for a good build.
Accessory PE and stuff? Mostly Not I - I'm an old scratch-builder. I'd start out with a kit - later, work up accessorizing - the opportunities for that are endless.
Paints? I'm really happy with Tamiya acryls and Testors ModelMaster enamels and acryls. Check this and other sites for lots of great discussions on paints and techniques.
I found getting a great airbrush was the big step towards larger modeling satisfaction, for me. Again, read around the modeling sites for lots of great info on tools!
New stuff I learned in the past 2 years: PE, indy links, better air-brushing, lots of newer paints and techniques, and weathering using pigments and pastel chalks.
Jump in and enjoy! Welcome back to the hobby, friend!
Bob