Hell, I know that one! I worked thoroughbreds until I got sick. Chemo kicked my ass and now I'm absolutely bent on running a herp shop or something of the like. Where do you live? I have a lot of local shops and breeders who share a lot of valuable information.
I also work at an accounting firm. I suggest you learn your book keeping first. Calculate high and predict income small. Subtract money for everything, including what you pay yourself. Nothing is free but profit is more than attainable with the right amount of will power, practicality, fiscal savvy and willingness to make the right decision, even if it doesn't yield the most immediate profit.