How do I navigate my new managers attitude that they "don't have time to train me" and an intro meeting that I requested to onboard "isn't necessary" and "not a valuable use of time"?

Like the title says.

Started a new job last week. Manager has very little time management abilities, which I knew from the interview, but was willing to work with because no place is perfect.

I'm trying to get trained. I'm trying to get onboarded. I'm trying to understand my job so I can pass my probationary period. I need this job. I don't have a second income, it's just me. I don't have a ton of savings as a medical issue took the bulk of my savings last year.

I didn't have equipment my first day. I had to pre-emptively send my tax and bank info by the 2nd day because I wasn't sent the info. I wasn't give proper software and app access and took 5 business days to start getting onboarded. Other than a 1-page offer letter I haven't signed any employee or benefits paperwork. It's a small business and no higher ups / corporate policy. Manager is the company owner.

I'm completely unaware of the metrics they're going to use to determine what makes a pass / fail for completing my probationary.

I tried setting a meeting 3x, twice last week, and once this week, to set expectations, sign paperwork, and onboard me, and they've either not shown up or straight up cancelled saying setting a meeting to communicate their goals for me is "not important." They did say they'll reschedule to Friday this week, but based on their attitude and literally telling me "I don't have time to train you," I do not believe the meeting will happen. Or the meeting will happen and all it will be is telling me how I'm wasting their time, instead of actually communicating their expectations, KPIs, and targets.

How do I handle this? Suck it up, even though I'm already in hypervigilence mode talking with them telling me 4 days into a new role it isn't worth their time to train me? Let them not train me /fail at tasks /not being onboarded properly, all the while look for another job? Lower my expectations and let them be in control of my future, and just be grateful for a job in this economy knowing that I'll fail in 1, 3 months? Push back and demand their time/training? Something else I don't know to do?