Hello Kariann,
In my relatively short career as an appraiser (three years thus far), I have learned a great deal that has been very beneficial in my investment partnerships. I would have to agree with my colleagues, however, that appraisal as a career is basically a "shot in the foot" for anyone trying to enter right now. Even as an appraiser, I have begun focusing heavily on investment based on the outlook for appraisers in the future.
My initial investment was well over $10,000 simply to obtain the adequate education and experience to feel competent in my abilities. Between software costs, licensing costs, education costs, gasoline, E&O insurance, Appraisal Institute dues, and MIBOR dues; it becomes a very capital intensive industry to enter. Also, as a trainee for two years (minimum) I would not expect to make any sort of profit. If your goal is to become an avid real estate investor, there are probably better part-time jobs which wouldn't require the upfront costs appraisal does.
This being said, there really is no substitute for the knowledge you can gain about value, buyers wants, price trends, etc. than you can gain as an appraiser. For me at least, it has led to an astute eye for investing.
The posts so far have been from appraisers with much more experience than I, and I'm sure their opinions hold more weight than my own. I just wanted to give you a perspective from a relative "newbie." I wish you the best in your investment career, however I don't want you to make a substantial investment in an appraisal career which would most likely be very difficult to turn a profit.