Yes you attorney should complete the G28.

My step mom wants to be our sponsor but shes concerned cause she lives in Texas im in Ohio can she help ?

A co-signer can reside in a different state and still act as co-signer.

Can my mother who left the USA get a waiver for overstaying her visitor visa by 2 years?

More information is needed about her overstay and possible immediate relatives in the US. Consult with an attorney in private for guidance.

You should provide a certified final docket with court disposition.

I submitted my I-485 and I-130, but the person who prepared my case also filed for I-131 and now I received a rejection letter?

It was likely a rejection of the application if it was not properly completed. Have an attorney review before submitting.

What should I tell the consular officer during immigrant visa interview?

For interview guidance it is best to consult with an attorney in private.

US greencard holder marrying Canadian Citizen?

The F2A visa category is current so you may be able to adjust status. Consult with an attorney for guidance.

Annulled my marriage and want to dismiss family based immigration case

You should submit a formal withdrawal to USCIS based on the information you provided.

I am 36yrs n my mother is a us citizen how long would it take for her to file for me?

What is your marital status and country of origin?

What are my options if my I-539 is pending while my I-94 is getting close to expire?

You may remain while the case is pending and should not be a problem for subsequent entries.