I`d give this a lot of thought before I embarked on an arrangement such as you described. Consider the following:
Are you putting any capital into the company at this time?
Are you comfortable with the valuation for your business at $102,000?
Finally, you say you sold 49% - but if you let him pay the "bills" - he has control of the business.
You may want him to sign a Private Placement Memorandum for your protection too. I agree with John. What are the terms of ROI or shared profit?
PPM`s are generally advisable when you intend to have several investors.
In most states, "partners" -those investors who will be active in the company are exempt from the securities registration regulations.
You should have some formal paperwork, however. A stock purchase agreement and buy/sell terms as a minimum.
Robert Johnson