How to withdraw my motion for OA?

You hit it right on the head: just file a notice of waiving oral argument / withdrawing your request. The Court may ask the other side if they care.

I've handled a lot of appeals, and while I've seen a last minute rescheduling of oral argument (due to counsel's medical emergency), I don't know...

What can I do next to help my friend out..

There are many competent criminal appellate attorneys across the state who provide free initial consultations about options and what to do next,...

What is best thing to do at this stage?

Hire competent appellate counsel. That’s not what you meant but it is the best thing for you to do right now. But to answer what you meant,...

Do I have any chances of winning?

Like my colleague said, no one can answer your question about what your chances are. I will add that the appellant bears the burden on appeal, so...

The Second District Court of appeals routinely grants requests for oral argument in many types of cases, so I would caution against reading...

On this case to file an appeal u have 30 days from the person who got convicted ?

Thirty days from rendition of the order you are appealing, and you file the notice of appeal with the same court that entered the order....

Can I win based on appellant's missing information on where the errors are preserved?

Appeals are their own practice area. Because the have their own Rules and own courts and often even attorneys who think they know how appeals work...

Some of the finest criminal appellate attorneys in Florida are assistant public defenders. But there are some real advantages to hiring counsel,...

In the initial brief, is it necessary to mention the locations where the errors are preserved?

The Appellate Practice Sections pro se handbook may help. http://prose.flabarappellate.org/ Most likely you need qualified representation.