Good info above.Just wanted to comment on the income side. Long ago, when I did appraisals they were $150 for a SFD, $200/225 for a duplex and so on. I did a commercial assessment of a gas company, half acreand a block building with a large propane tank and concrete platform, it was $1,200 as i recall.
But now, you have to earn your way up, fora license certification. Here, I believe it's 5 years (as set in hours) to go for the commercial license.
Certification is set by statute in most states now, and required to do any deal that is financied with fed funds attached to in any manner.
After you get your feet wet, and if your state allows it, you can do work in other areas as well.
If you're working with an appraiser you'll find that it depends on the purpose of the appraisal.
Attorneys have appraisals done for estates, estate planning and trusts, tax purposes, commercial properties can be done to adjust assets on the books, bankruptcies will often get an appraisal, so the type of work you go int will have a bearing on income. For example, bankruptcies might be $150 for a SFD, but it can be a letter of opinion and you might do 4 per day!
After a few years, you might look into getting with a national service and do review appraisals, reviewing the work of others who did a home appraisal, last I heard those were $100. each, but you could do one an hour and drink all the coffee you want.
I have a friend who has a very large national appraisal service and subs out work all over the country. He doesn't really do any, but mainly places commercial deals. That operation runs about 5M annually for him.
So asking what an appriaser makes is kind of like asking what a Realtor makes, if they are so so, they drive older trucks, good ones make a very nice living and drive new Fords, smarter ones make more and show up in an Escalade. A good business person with a license doesn't drive anything to an appraisal and they drive what ever they want anyplace they want to go.