Design Options Furniture

Which design pathway would be the most flexible?
I am a musician interested in following a design path and I still cannot make up my mind after a year mulling over it. I am interested in furniture and home-wares but I also have a great love of T-shirts. I am considering graphic, product, furniture and interior design. My question is: Which of these would have the most flexible options, say if I wanted to be self-employed, and which would provide the most commissions or opportunities for work? I am not really interested in going full-time as it could clash with my music, but would like something to be flexible enough that I could work around it but still earn some form of living. Any thoughts? I would welcome anybody’s feedback, but especially from any self-employed designers out there.
The furniture design is a great life. With all the production moving to China, there is not much future today. If it comes back, you will be sitting on top of the world, so do it..
Decorating with Furniture Layout – Part Two – QC Design School