I am not sure about the app specifics, but looking at it on a web browser, it looks like the attestation form does not ask for how many students are currently enrolled, just how many were enrolled over the last year; if it is a new program and had none, then I would attest to none. Also, I do not see any ratio questions of student to instructor either, but that answer would have to match what the case has been over the previous year, say for example, one instructor to twelve students (1:12). Another way to answer the ratio question could be your potential maximum capacity, such as one instructor to twenty students (1:20) or two instructors to thirty students (2:30), whatever the case may be for your program.
If nothing else, contact the P.T.C.B. for clarification: https://www.ptcb.org/contact53