Ever since I made the Bird Cage for my wife, I've had several people ask me to how much to make things for them. I have a request for a desk, and another for an entertainment center at the moment.
I'm reluctant to start doing stuff for other people because mainly I still work a full time job. And I've had a couple of things happen when I did make something for a profit, that wasn't really worth it.
I had one of my wifes coworkers ask me to make a custom size toybox, and I relied on them for the the dimensions, but after it was delivered it was too long and I had to cut an inch off each end (their dimensions were wrong). this after I had assembled glued and screwed it together. Learned a leson "go get the measurements for your self". If I figure in the rework time. I lost money on that project.
I plan on doing a small business in wood working when I retire to help fill in on the income when I can; I even have the name and domain reserved A1 Wood Works.
a1woodworks.com hopefully by then I can still do the work.
Right now I just do it as a Hobby, with the random paid projects from time to time.