Hi Tony, if you haven't started using Lightroom yet, a few things to consider before you do; read up on catalog files and decide what is best for you - you can have more than one catalog file, but you will have to manually switch between them. You may wish to use a different catalog file for different situations for example professional work over personal work etc. Think about using keywords if you don't do this already. You can apply keywords during the import stage (or later at any time if you wish). I think finding images using keywords very helpful especially when your catalog runs into the 10's of thousands of images! Think about the usefulness of keywords. You can have as many or as few as you wish. I try keep mine relatively simple, for example "landscape", seascape", "waterfalls", "family", "holiday", "rivers" and so on. Use things that you will remember. On a similar subject, Lightroom, like most other software, allows you to grade your images. This is on a scale of 0 to 5 and various colours with combinations of numeric grading and colours allowable. Again, consider setting yourself some rules. Personally after importing the images, I run very quickly through the images and give a first-pass rating. Rating zero is for deletion (not in focus or something else that makes the image unusable), rating 4 for images that I like most and will work on as my priority, rating 3 as images that I like but will work on as my second priority, rating 2 for technically nothing wrong with the image but it doesn't "jump out" at me. I may never work on a rating 2 image and may end up deleting them after a while. Any image I post-process then is assigned rating 5 (my top rating) so all my completed work is rating 5. I may then apply a colour to a rating 5 image if it is one I want to print or to submit for competition. You should also consider how the files will be stored on import; will you define where Lightroom stores them, or will you let Lightroom define this? I personally let Lightroom store them by date and by using keywords and ratings, I can find any image I want quickly without having to try remember what folder I stored it in.Also, when working on images, I find it useful to create a "virtual" copy of the master image and work on this. that way, i can create different versions of the same image easily since I always have the oroingal raw image un-processed. If you use NIK Efex, it will create a copy image for you anyway, so you don't have to worry about creating a virtual copy of you are going to apply a NIK Efex process.
Enjoy using Lightroom and NIK Efex, both will inspire you to go out and capture more images knowing you have very capable tools at home to do the images justice :-)