We've given you all the proper forms to do this, to make the change of ownership for a sole proprietor, for a partnership or for limited liability company or limited liability partnership.
Basically, the business is assigned if you're a sole proprietor, it's a simple assignment.
If it's a partnership, the partner changes from you as an individual to you as trustee of the trust.
If it's an LLC, the member of the LLC becomes you as trustee of the trust.