If the H1B extension got denied, would the 240 days policy excuse my days of work after the I-94 expiration date?

You should contact your employer's attorney for these very important questions.

Is there a minimum duration of H1B like a year or so? For e.g. Can USCIS approve H1B only for 3 months?

The duration on your H1B will be indicated on your approval letter. If you have additional questions, consult your company attorney.

I have withdraw the I130 petion for my sister in 2009 and the reason which i put on the letter

You can reapply with a new petition. Have her consult an attorney.

I am US citizen and going to file i-130 for my brother. There is a age issue between me and my brother need legal advice.

That issue will create a problem. You must fix it. Contact your country and see if you can obtain a judgment correcting your birth certificate.

Hi, I am outside USA , I have RTD expired 05/13/2103 but I didn't have green card please can I apply to renewal

You can apply. Whether your request is granted will depend on many factors that you should discuss with an attorney.

I got my PERM/Labor and I140 approved by my previous employer back in 09/18/2012,

You should talk to an attorney for verification of your status.

OPT Travel

More information is needed to answer your question.

Do I check box 19 on USCIS I-751 Form if I am the petitioning spouse filling it out, not an attorney or any one else?

If you need assistance completing a form, you need to contact an attorney. Attorneys in this forum do not typically answer this type of questions...

Can get a visitors visa to go to court on a custody / child support hearing

You should consult an attorney as soon as possible for this very complicated matter.

How long do i have to wait to petition after divorce.

There is no waiting for filing for another spouse after divorce.

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