Can you tell me exactly what kind of jobs wildlife professionals/foresters can take up in offices & laboratories besides outdoors?

I am a graduate in zoology (2004) & working as a PR professional for past 7 years. I want to make a career in biological sciences/wildlife. will i be able to get into a reputed institute for M.Sc or JRship afterwards as I am 29 now? Please Suggest some viable career options.