Definitely not a pro but would like to be.
With that said I took my hobby to the next level this year and opened my own gallery. It is entirely a money losing proposition. I had two goals for the gallery - to see where it leads and to push me to do more work. With that in mind it has been successful beyond my dreams.
I have had some moderate success with 8x10 prints for $10. Sales really fluctuate but would be much better if I were here full time. As it is I have a desk job Monday - Friday so I am only at the gallery in the evenings. For the bigger prints the 12x18 go for $260 or $420 framed and the 20x30s are $780/$1100. It can be months between sales of the bigger sizes. The location has the potential for a lot of foot traffic but it is an odd place and you have to work to bring people inside. All in all the price is right and that's what has kept me here.
It has been a lot of work but also a lot of fun. The best advice I can offer is to not plan on making any money from the hobby. If you want to make a business out of it then you have to jump in with both feet and have a viable business plan. For me the gallery has been an extension of the hobby. Since I didn't expect anything out of it, it has been a wonderful experience.
The best advice I can offer is to put your work out there and see what people say. Friends and family will always tell you it is the best thing they have ever seen. Strangers don't pull their punches.
The process has really surprised me. Prints that I think won't do so well end up being some of my most popular. It has been a real eye opener.
Just don't forget to have fun with it.