Have the police been contacted? If not do so ASAP

Can I immediately terminate his lease and change the lock? If so what steps must I take?

Use the legal process you have already started.

Can a person be his/her own sponsor once they are authorized to work in US?

Depending on how you got your green card, you will still need a sponsor but you can use your salary to meet the income requirements.

Have you tried contacting your Congressperson for assistance?

Time left on H1B?

The change of status approval date stops the H-1B clock. You can request a copy of the approval notice from USCIS on their website.

Can I leave rental without prior notice?

You are still required to give him notice (and if you do, maybe he will not raise the rent since it is usually easier to keep a tenant then replace...

We have issued a properly served three day notice to vacate tenant has ignored. what do we do next?

You should report all violence to the police ASAP

Am I responsible for paying the taxes stated in my lease?

Usually if a term is stated in the lease, the lease controls even if the landlord doesn't enforce it for a period of time.

Please note that you must submit your TPS application THIS month.

I539 Visa change from H4 to F1.

Have you tried making an Infopass appointment?