Base on my situation above,Will the Guangzhou Consulate IO deny my application again and what should i really pay attention to?

Previously asked and answered - review previous posting.

As an H4 visa holder , can I start a meetup group and charge a fee ?

You may not do so without a valid EAD.

How long will it take for Green Card process - Family Fourth Preference for me , being from country Nepal?

Generally more than 10 years. Review the visa bulletin at www.state.gov.

It means that your case was approved - await further processing.

Travel outside USA on H1B within 6 months of visa expiration

Contact your company's US immigration attorney prior to leaving the US.

Technically no. Contact your DSO and/or US immigration attorney with our receipt notices so they can update SEVIS appropriately.

Contact a US immigration attorney for a specific review. I don't know what the code itself is, but the entire record of deportable alien is...

Now i got a new employer who is ready to re-file my case with the same approved H1B, is it possible ? under cap-exemption ?

A new employer can file an H1B for you. Provide the visa refusal information to the company's US immigration attorney.

Same As Above.

Contact a US immigration attorney prior to filing an I130 due to the risks for future visas and entries for your family members and to discuss...

incorrectly completed application form for a green card, a disqualification?

Contact a US immigration attorney for specific review.