#1 Have fun! When some people hear how much I run, they think that I must be really dedicated to train so much. The truth is that I really just like to run and I live in an area (not by accident) where I look forward to running (almost) everyday because it is fun and inspiring to be out in the woods.
#2 Try to experience lactic acid at least a few times a week. Even when I am getting close to my most important races, I do not do much structured speedwork. I do, however, run the uphills on my two+ hour training runs hard enough to "feel the burn" anywhere from two to five times per week. When it come to running well in the mountains, the most important factor in performance is not how fast you can run but how fast you can run before your legs start filling up with battery acid. Anything that you can do to improve your lactate threshold will make you faster on the mountain.
#3 Find out what works for you and do it. There is probably a "right" way to train for the marathon or a 10k on the track. For mountain and trail running, however, this is probably not the case. I have spoken with several different mountain runners over the years (many of whom are really fast) and the different training regimens are pretty amazing from one to the next. It may require a few years of experimentation but it is worth it in the end.
#1 See (1) above
#2 Goals (positive): I have many goals that I still want to accomplish. Most of these involve either specific times on specific courses, high places in international events, or weight loss.
#3 Goals (negative): Sorry, I keep these to myself.