There's no base. You'll be offered support, but will basically have to learn on your own. The first two years I was doing this I made $18K and $20K. I had to wait tables as I built my client base. I'm stressed, can't sleep, and have become an amazing grouch for a 30 year old. My position is still new to me, I sometimes wish I could go back to what I was doing, less responsibility, shorter days, etc.
I kind of envy the guys that just walk around the mall with a broom and dustpan. It seems like bliss sometimes.