The short answer
Where the classic path begins
If the file is thin, has no cards, or sits under 600, start here first. That is how the path from no or bad credit toward a first 0% business funding round actually begins. Secured cards, through a credit union that already has the product. That is the first rung. Open the membership, fund a checking and savings account, then ask for the secured card terms and the graduation policy. The product is second. The relationship is first.
Empty revolving history is a real wrinkle. A later lender that wants to see how you handle a revolving account has nothing to read. Building one reporting revolving tradeline is the job of this step. It is not the whole program. National and tier-one products still matter once the file is thicker. They are the next rungs, not this one.
A national secured card can still deny a thin or sub-600 file. People treat that denial as the end of the honest path and take a fee-heavy subprime card with a tiny limit that does not grow. That is the trap. A credit union product that can graduate is the first alternative, not a forever plan. Secured cards function similarly once they are open. Make sure the one you fund reports to Experian, Equifax and TransUnion.
None of this is a promised score, limit, round or date. Approvals and terms are decided by the institution and depend on what is actually on the file. Stacking Capital is not a bank, a lender or a broker, and it is not a credit stacking company.