Can I change my status from B1 to F1 while I am in the U.S?

You can try. Depending on your prior Immigration history, qualifications for F and timing of your application, you may succeed.

Can a F-1 Student start non-profit online startup company?

I would say do not do it. The chances that you lose your status before you prove your point are great. So, if you would like to remain in F1, stay...

How can I obtain a green card if I'm an 18 year old? I have a work permit but I need a green card in order to receive fin aid.

You need to qualify for it through one of the ways: family immigration, employment, investment, asylum, U visa, etc. Speak with a lawyer.

Do I need a PCC

The instructions are clear: all countries EXCEPT for the US. (If you are applying for an Immigrant US visa).

Should we postpone the interview or wait and see what happens?

Only you know if you want to postpone it or not. You can appear on the date of the interview, if she can cannot come and let them know the reason....

Can I work with two employers with respective H1B sponsors in California for 5 hours each?

You can work only for an employer who sponsored you for H1B. If you would like to work for one more company, than that company has to file an H1B...

When can I apply for Citizenship

Read the requirements carefully. They are available at www.uscis.gov. If you need a legal advice, consult with an attorney.

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Will uscis accept the affidavit of support using her income ?

You will have to find a joint sponsor likely.

1) Are ownership of 2 LLCs, as well as personal checking + brokerage + retirement acc enough to show US as primary residence?

It all depends who is looking at your records. I would say that an ownership in itself does not show that you reside here. You would need to show...

is there any chance that I still maintain my F1 Visa and come back to the U.S for Fall Semester or should I just stay here?

You have to bring your records about the incident to an Immigration attorney and consult regarding the issue.