Promissory notes are quite simple and can be prepared by anyone. They do not need to be prepared by a lawyer or be notarized. It isn't even particularly significant whether a promissory note is handwritten or typed and printed.
(a) a credit agreement to finance a transaction between the borrower and the lender, whether forming part of that agreement or not; (b) a credit agreement: (i) to finance a transaction between the borrower and a person ("the supplier") other than the lender, and.
Promissory notes are contracts and contracts don't make dishonest people honest. A DIY contract is likely a mistake. You can buy a promissory note off of a site like or use a local attorney.