Are looking to track for IPO, AKC and just for sport, OR, are you looking for trailing which is more 'real world' type scent work...?
Sport is more obedience and crushed vegetation = tracking
Trailing is more scent discrimination (following a given odor/person) and covers all surfaces, allows for scent movement etc
Both are great fun and excellent exercise for you and the dog. The difference being in what you focus on and how adherent you become to following footsteps vs where scent actually is...