US Immigration from Finland

We are going to start our k-1 application soon, but I m looking into the future of getting a green card, and I have a questions about joint sponsors. How enforceable is the I-864? Let s say one of my parents is a joint sponsor. But eventually we both get a job, live in our own house and financially support each other. Is my parent still required to support him? What if they don t? I don t want my parents to be responsible for him for many years.

I want to start freelance but I m unsure if I can fill out the I-864 with that kind of work..

I ve seen people say that I-129f is the fastest way to get to the US, but is this still true? A 15.5 month wait doesn t seem fast to me. Would getting married over zoom, then applying for a spousal visa be quicker than I-129f??

My partner is a Finnish citizen and usually visits me on ESTA. He has an apartment, but no job. He tells me he can provide his apartment ownership translated, but the recipes of his rent can't be translated. I want to know is it a good idea for him to visit the US while I-129f is pending? Is it likely he will be denied entry? He has a perfect record and never overstayed a visit.

So me and my partner haven t officially planned a wedding. We know what we want, but haven t officially planned it. We were going to plan it while the visa is being approved because it takes forever.
I know you should have a letter of intent to marry with signatures of us both. Is this enough proof for them? I can take a picture of the ring, and I can technically make a prototype wedding invitation, but I don t know the dates and location because god knows whenever the visa will be approved.
I am also wondering, can the signatures on the letter be digital? My partner doesn t have a printer, but he can go to the library if it s necessary.

I ve never been employed by an employer, I ve done freelance gigs and was technically self employed but I never made enough money for it to be full time. I m in school currently, what should I fill out for that part of the form? My partner also has never been employed, what do I fill out on that section for the form? Do I leave it blank?