I was arrested when I was 15 years old for possession of a knife at school. Can I have any problem with immigration? Now I am 18

You need to get the certificate of disposition for the charges that were filed against you and see an attorney.

Do i need to go back to my country to get my green card??

It might be a bit more complicated than you think, but if you have a valid TPS there is a way for you to get a green card. Meet with an attorney.

Can my parents file for me in the future if have a abandoned a green card in the past?

They can. If you get it or not depends on many issues, but if all you did just left the country, you should have no problem.

Which form to file for medical parole. Can I do it myself

Humanitarian parole is filed using i 131 form. However, you are already here, and it will be solely up to the DHS if you can stay longer. You can...

My mother was recently arrested for assault she's my Petitioner will this stop me from getting a green card?

It looks like you will be fine even if she is convicted.

You need to wait until you receive the rejected package, or you can resubmit all again with the correct fee before the deadline.

Am I allowed to create an E-commerce while in a process with the immigration?

You probably can do it, but it's best if you discuss it with an attorney so that he/she will have a full picture of your case and status.

What is the chance of my I-20 be reinstated?

If you fell out of F1 status, you need to present a very good reason why you did not comply with the Immigration and school requirements. It's best...

My wife is applying for my change of status from f1 visa. We do not currently live in the same house for financial reasons

The short answer would be that you need to retain a good lawyer who will help you to explain all these "don't have's" of your case.

Name check? There is a background check, they will get the FBI records stored under your fingerprints..