Look at form I-864P on the US CIS website.

You are not the first person that thought of this 'clever idea. No, it will NOT work ... it is an impermissible way of attempting self employment.

Changing the USCIS service center to Texas(TSC)?

Sorry you can not change service centers .... don't waste time looking at processing time charts.

Yes, there will be a presumption that you have demonstrated immigrant intent.

18 Month Physical Presence in United States to apply for Naturalization?

Assuming that you are still living with your spouse ... you should be OK.

I am 16 i turn 17 in two weeks on April 24th and i graduate this year, I am class of 2020. Am i allowed to move out at 17.

Not an immigration question ... I'll re-classify.

Do I need to apply for form I-601 when applying for I-485?

I agree with my colleague .... form I=601 probably isn't needed ... have an attorney review things.

Can I be a preparer for my mum.

Yes, you can be a preparer ... but, you'd be wise to have an attorney review a PDF of the forms/documents ... there is more to this process than...

Lost my Permanent residence trying to replace what is the code on the front had it since I was 9 yrs old?

Did you lose your permanent residence, or did you lose the card? What application are you working on? I-90? Consider filing form G-639 to...

Passport renew before applying for AOS?

1. Make a FULL color photocopy of every page in the passport. Keep the scan and apply for AOS with the copy ... the sooner, the better.