Your fun has just begun! About 5 years ago I retired and bought a D300 and, at first, some DX lenses then FX lenses with an eye to my next body. Last summer I bought a D800. Along the way I "invested" in a good tripod and a gimbal to stabilize long lenses and landscape HDR sets. You have great wide and midrange lenses. Don’t get hung up on getting lenses with consecutive non overlapping focal lengths. I’ve found that having overlapping focal lengths is much more convenient as every other time I go out, my mood and the subject is somehow different and the same place yesterday my shots were 35 to 180mm and today they were all 100 to 300mm or . . . Thoughts:
For wildlife you need speed and length with good light. For birds, even more so; for small flighty birds a long enough fast enough lens has yet to be made. 70-200 f/2.8 with a TC2 III for 400mm @ f/5.6 or a 300mm f/2.8 is a sharp bright 300mm and with a TC2 III is 600mm @ f/5.6. The D000/E will auto focus up to f/8.
Darkroom work in your past? Good, you now get to learn about cropping, dodging, burning, brightness, contrast, and white balance on a computer. Now add sharpening and noise reduction. Yes, you want to shoot NEF RAW files if you want to get the most out of your high quality glass. Convert or Save As to JPG afterwards. I enjoyed the time I spent in a darkroom and I now enjoy the time I spend post processing (PP) my images, often as much as I enjoyed getting the image in the first place. As well, don’t forget that you will be getting a lot of large digital files to sort, delete, manipulate, catalogue, save, and backup.
Now about that computer with a lot of RAM and fast drives and a large moitor and software that you have never heard about . . . What the hell is HDR? Oh, you are sooo going to enjoy yourself!
Suggestion, checkout the Nikonian workshops; workshops like these will greatly accelerate your learning curve(s).