Sole Proprietor to Partnership? Or sell shares? Form a corporation?

I have owned and operated a small company for the past five years and invested around $45,000 into it. It has a strong profit margin but earns a modest annual gross income...around 40,000. To expand I have been approached by people who can program and could expand my website and monthly magazine. I am wondering how to move forward without going into debt for it. Profit sharing? Partnership? Shares?