You can't get clients without a product. Your prospective clients will want to see, feel and smell your product. So you should buy samples of your product first and then go get the clients.

You might also want to consider what other products / services you will offer and offering samples of those as well. Once you become licensed or whatever the requirements are for your state, then you can start attending conventions and trade shows and pushing your product there. It takes money to make money and you will probably have to invest quite a bit before you get your first client.

If you feel passionate about your product then go for it. Research loans and grants, find potential investors, do whatever it takes to launch your business.