As everyone else said, they are two different things.
Nosework - very similar to narcotic detection. The dog uses air scenting to find a specific smell anywhere in a container, a room, an outdoor area, and around vehicles. The scents used are birch, anise, and clove.
Tracking - (AKC tracking) - dog follows human scent or another school of thought is that the dog follows crushed vegetation - maybe it's both. The dog has to follow the scent for over 440 yards for just the TD title. The dog does not have to track footstep to footstep, their nose does not have to be on the ground, and they can even go off track as long as they don't go too far.
I do both and have been successful - Mikko is titled in Nosework and hopefully will have his first tracking title this fall (TD). We were supposed to certify (test you have to do before you can attempt a TD) at the end of this month, but recent events have halted our training for a bit. I have found no problem with training both. I use different words (search and track), different equipment (harness for tracking), and just the scent in general is so different - a dog knows when there is birch, anise, or clove around! I have never felt like my dog was confused.
I agree - tracking is something that you want to work with other people. Maybe there is a seminar that you can find and attend and then gain contacts? My area had no tracking clubs, but after a recent seminar I started a Facebook group and invited people from the seminar and now we can plan to get together and train. Before that, I just attended seminars and put my husband to work.