Chances of having my visa approved?

YOu will definitely have to present certified dispositions for both arrests, and maybe some other documents. You should talk to a lawyer directly...

If I marry my girlfriend who has her green card, will I be immediately eligible to stay in US if I lose my H1B status?

I would write just the word, "no," but I have to write 35 characters.

Warrant information

That is strange they will not confirm the existence of a warrant. Hire a lawyer.

Is it possible to do so and to be honest on a scale of 1 to 10, what are the chances of approval?

Maybe. It is definitely a difficult case, but it is worth trying. You need to speak to a lawyer to discuss the details.

It seems like you don't have a lawyer. What you should do is write down all the questions you can remember and all the answers you provided. You...

Is it possible to renew my green card and approximately how long will the procedure take, if granted?

It is highly unlikely, but you could try.

What can I do in this case, what would be the best route to take to be able to enter to the united states legally?

If you were convicted as a juvenile, that conviction should not be held against you for immigration purposes. If you were convicted as an adult...

Can I sponsor a non relative who just married a US citizen? but she is only 18 and does not work?

Your question is not clear and the issues are very important. I suggest you schedule a consultation with an immigration lawyer. I suggest you make...

If you were convicted of disorderly conduct, it will be disorderly conduct. Anyone with a criminal history, even a minor one, would be foolish to...

What options do I have left

No one can guarantee you to change the sentence, but if you are not yet in jail it is possible to try. An appeal is possible but also very...