Getting out of the warehouse...

I've been a member of Treehouse for a few months now, and it's one of the best investments I've ever made. My goal is to eventually try my hand at starting a business (I'm especially interested in accelerating small and independent businesses). That, of course, is quite a learning curve requiring lots of experience, knowledge, and money. So in the mean time I work at a warehouse to pay the bills. I'd like to have valuable work experiences through the next few years which may lead to useful knowledge when starting my own company someday. And quite honestly, I'm thoroughly exhausted from working in the warehouse (my blood pressure is high enough).

I'm looking for advice on how to change careers. I'd like to get into web design, but I've still got a lot to learn until I feel confident in applying for that sort of position. Until then, I'd like to have a desk job (or even remote job) where I can use the skills I have now. Currently, I feel comfortably proficient in a lot of Office applications (word, excel, powerpoint). I'm quite handy with Flash and Photoshop and adequate with a lot of Adobe software. I'm decent with HTML and CSS and I'm getting a good understanding of Quickbooks.

What positions should I be looking for right now? What software/skills should I be gaining? I don't have any university degrees or official certifications, so how can I prove to my potential employer that I can actually do what I say I can? And actually, just general advice about this decision is appreciated.

Thanks for any help!